2 * NET3 Protocol independent device support routines.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
9 * Derived from the non IP parts of dev.c 1.0.19
11 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
12 * Mark Evans, <evansmp@uhura.aston.ac.uk>
15 * Florian la Roche <rzsfl@rz.uni-sb.de>
16 * Alan Cox <gw4pts@gw4pts.ampr.org>
17 * David Hinds <dahinds@users.sourceforge.net>
18 * Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
19 * Adam Sulmicki <adam@cfar.umd.edu>
20 * Pekka Riikonen <priikone@poesidon.pspt.fi>
23 * D.J. Barrow : Fixed bug where dev->refcnt gets set
24 * to 2 if register_netdev gets called
25 * before net_dev_init & also removed a
26 * few lines of code in the process.
27 * Alan Cox : device private ioctl copies fields back.
28 * Alan Cox : Transmit queue code does relevant
29 * stunts to keep the queue safe.
30 * Alan Cox : Fixed double lock.
31 * Alan Cox : Fixed promisc NULL pointer trap
32 * ???????? : Support the full private ioctl range
33 * Alan Cox : Moved ioctl permission check into
35 * Tim Kordas : SIOCADDMULTI/SIOCDELMULTI
36 * Alan Cox : 100 backlog just doesn't cut it when
37 * you start doing multicast video 8)
38 * Alan Cox : Rewrote net_bh and list manager.
39 * Alan Cox : Fix ETH_P_ALL echoback lengths.
40 * Alan Cox : Took out transmit every packet pass
41 * Saved a few bytes in the ioctl handler
42 * Alan Cox : Network driver sets packet type before
43 * calling netif_rx. Saves a function
45 * Alan Cox : Hashed net_bh()
46 * Richard Kooijman: Timestamp fixes.
47 * Alan Cox : Wrong field in SIOCGIFDSTADDR
48 * Alan Cox : Device lock protection.
49 * Alan Cox : Fixed nasty side effect of device close
51 * Rudi Cilibrasi : Pass the right thing to
53 * Dave Miller : 32bit quantity for the device lock to
54 * make it work out on a Sparc.
55 * Bjorn Ekwall : Added KERNELD hack.
56 * Alan Cox : Cleaned up the backlog initialise.
57 * Craig Metz : SIOCGIFCONF fix if space for under
59 * Thomas Bogendoerfer : Return ENODEV for dev_open, if there
60 * is no device open function.
61 * Andi Kleen : Fix error reporting for SIOCGIFCONF
62 * Michael Chastain : Fix signed/unsigned for SIOCGIFCONF
63 * Cyrus Durgin : Cleaned for KMOD
64 * Adam Sulmicki : Bug Fix : Network Device Unload
65 * A network device unload needs to purge
67 * Paul Rusty Russell : SIOCSIFNAME
68 * Pekka Riikonen : Netdev boot-time settings code
69 * Andrew Morton : Make unregister_netdevice wait
70 * indefinitely on dev->refcnt
71 * J Hadi Salim : - Backlog queue sampling
72 * - netif_rx() feedback
75 #include <asm/uaccess.h>
76 #include <linux/bitops.h>
77 #include <linux/capability.h>
78 #include <linux/cpu.h>
79 #include <linux/types.h>
80 #include <linux/kernel.h>
81 #include <linux/hash.h>
82 #include <linux/slab.h>
83 #include <linux/sched.h>
84 #include <linux/mutex.h>
85 #include <linux/string.h>
87 #include <linux/socket.h>
88 #include <linux/sockios.h>
89 #include <linux/errno.h>
90 #include <linux/interrupt.h>
91 #include <linux/if_ether.h>
92 #include <linux/netdevice.h>
93 #include <linux/etherdevice.h>
94 #include <linux/ethtool.h>
95 #include <linux/notifier.h>
96 #include <linux/skbuff.h>
97 #include <linux/bpf.h>
98 #include <net/net_namespace.h>
100 #include <net/busy_poll.h>
101 #include <linux/rtnetlink.h>
102 #include <linux/stat.h>
104 #include <net/dst_metadata.h>
105 #include <net/pkt_sched.h>
106 #include <net/checksum.h>
107 #include <net/xfrm.h>
108 #include <linux/highmem.h>
109 #include <linux/init.h>
110 #include <linux/module.h>
111 #include <linux/netpoll.h>
112 #include <linux/rcupdate.h>
113 #include <linux/delay.h>
114 #include <net/iw_handler.h>
115 #include <asm/current.h>
116 #include <linux/audit.h>
117 #include <linux/dmaengine.h>
118 #include <linux/err.h>
119 #include <linux/ctype.h>
120 #include <linux/if_arp.h>
121 #include <linux/if_vlan.h>
122 #include <linux/ip.h>
124 #include <net/mpls.h>
125 #include <linux/ipv6.h>
126 #include <linux/in.h>
127 #include <linux/jhash.h>
128 #include <linux/random.h>
129 #include <trace/events/napi.h>
130 #include <trace/events/net.h>
131 #include <trace/events/skb.h>
132 #include <linux/pci.h>
133 #include <linux/inetdevice.h>
134 #include <linux/cpu_rmap.h>
135 #include <linux/static_key.h>
136 #include <linux/hashtable.h>
137 #include <linux/vmalloc.h>
138 #include <linux/if_macvlan.h>
139 #include <linux/errqueue.h>
140 #include <linux/hrtimer.h>
141 #include <linux/netfilter_ingress.h>
142 #include <linux/sctp.h>
143 #include <linux/crash_dump.h>
145 #include "net-sysfs.h"
147 /* Instead of increasing this, you should create a hash table. */
148 #define MAX_GRO_SKBS 8
150 /* This should be increased if a protocol with a bigger head is added. */
151 #define GRO_MAX_HEAD (MAX_HEADER + 128)
153 static DEFINE_SPINLOCK(ptype_lock);
154 static DEFINE_SPINLOCK(offload_lock);
155 struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
156 struct list_head ptype_all __read_mostly; /* Taps */
157 static struct list_head offload_base __read_mostly;
159 static int netif_rx_internal(struct sk_buff *skb);
160 static int call_netdevice_notifiers_info(unsigned long val,
161 struct net_device *dev,
162 struct netdev_notifier_info *info);
165 * The @dev_base_head list is protected by @dev_base_lock and the rtnl
168 * Pure readers hold dev_base_lock for reading, or rcu_read_lock()
170 * Writers must hold the rtnl semaphore while they loop through the
171 * dev_base_head list, and hold dev_base_lock for writing when they do the
172 * actual updates. This allows pure readers to access the list even
173 * while a writer is preparing to update it.
175 * To put it another way, dev_base_lock is held for writing only to
176 * protect against pure readers; the rtnl semaphore provides the
177 * protection against other writers.
179 * See, for example usages, register_netdevice() and
180 * unregister_netdevice(), which must be called with the rtnl
183 DEFINE_RWLOCK(dev_base_lock);
184 EXPORT_SYMBOL(dev_base_lock);
186 /* protects napi_hash addition/deletion and napi_gen_id */
187 static DEFINE_SPINLOCK(napi_hash_lock);
189 static unsigned int napi_gen_id = NR_CPUS;
190 static DEFINE_READ_MOSTLY_HASHTABLE(napi_hash, 8);
192 static seqcount_t devnet_rename_seq;
194 static inline void dev_base_seq_inc(struct net *net)
196 while (++net->dev_base_seq == 0);
199 static inline struct hlist_head *dev_name_hash(struct net *net, const char *name)
201 unsigned int hash = full_name_hash(net, name, strnlen(name, IFNAMSIZ));
203 return &net->dev_name_head[hash_32(hash, NETDEV_HASHBITS)];
206 static inline struct hlist_head *dev_index_hash(struct net *net, int ifindex)
208 return &net->dev_index_head[ifindex & (NETDEV_HASHENTRIES - 1)];
211 static inline void rps_lock(struct softnet_data *sd)
214 spin_lock(&sd->input_pkt_queue.lock);
218 static inline void rps_unlock(struct softnet_data *sd)
221 spin_unlock(&sd->input_pkt_queue.lock);
225 /* Device list insertion */
226 static void list_netdevice(struct net_device *dev)
228 struct net *net = dev_net(dev);
232 write_lock_bh(&dev_base_lock);
233 list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
234 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
235 hlist_add_head_rcu(&dev->index_hlist,
236 dev_index_hash(net, dev->ifindex));
237 write_unlock_bh(&dev_base_lock);
239 dev_base_seq_inc(net);
242 /* Device list removal
243 * caller must respect a RCU grace period before freeing/reusing dev
245 static void unlist_netdevice(struct net_device *dev)
249 /* Unlink dev from the device chain */
250 write_lock_bh(&dev_base_lock);
251 list_del_rcu(&dev->dev_list);
252 hlist_del_rcu(&dev->name_hlist);
253 hlist_del_rcu(&dev->index_hlist);
254 write_unlock_bh(&dev_base_lock);
256 dev_base_seq_inc(dev_net(dev));
263 static RAW_NOTIFIER_HEAD(netdev_chain);
266 * Device drivers call our routines to queue packets here. We empty the
267 * queue in the local softnet handler.
270 DEFINE_PER_CPU_ALIGNED(struct softnet_data, softnet_data);
271 EXPORT_PER_CPU_SYMBOL(softnet_data);
273 #ifdef CONFIG_LOCKDEP
275 * register_netdevice() inits txq->_xmit_lock and sets lockdep class
276 * according to dev->type
278 static const unsigned short netdev_lock_type[] =
279 {ARPHRD_NETROM, ARPHRD_ETHER, ARPHRD_EETHER, ARPHRD_AX25,
280 ARPHRD_PRONET, ARPHRD_CHAOS, ARPHRD_IEEE802, ARPHRD_ARCNET,
281 ARPHRD_APPLETLK, ARPHRD_DLCI, ARPHRD_ATM, ARPHRD_METRICOM,
282 ARPHRD_IEEE1394, ARPHRD_EUI64, ARPHRD_INFINIBAND, ARPHRD_SLIP,
283 ARPHRD_CSLIP, ARPHRD_SLIP6, ARPHRD_CSLIP6, ARPHRD_RSRVD,
284 ARPHRD_ADAPT, ARPHRD_ROSE, ARPHRD_X25, ARPHRD_HWX25,
285 ARPHRD_PPP, ARPHRD_CISCO, ARPHRD_LAPB, ARPHRD_DDCMP,
286 ARPHRD_RAWHDLC, ARPHRD_TUNNEL, ARPHRD_TUNNEL6, ARPHRD_FRAD,
287 ARPHRD_SKIP, ARPHRD_LOOPBACK, ARPHRD_LOCALTLK, ARPHRD_FDDI,
288 ARPHRD_BIF, ARPHRD_SIT, ARPHRD_IPDDP, ARPHRD_IPGRE,
289 ARPHRD_PIMREG, ARPHRD_HIPPI, ARPHRD_ASH, ARPHRD_ECONET,
290 ARPHRD_IRDA, ARPHRD_FCPP, ARPHRD_FCAL, ARPHRD_FCPL,
291 ARPHRD_FCFABRIC, ARPHRD_IEEE80211, ARPHRD_IEEE80211_PRISM,
292 ARPHRD_IEEE80211_RADIOTAP, ARPHRD_PHONET, ARPHRD_PHONET_PIPE,
293 ARPHRD_IEEE802154, ARPHRD_VOID, ARPHRD_NONE};
295 static const char *const netdev_lock_name[] =
296 {"_xmit_NETROM", "_xmit_ETHER", "_xmit_EETHER", "_xmit_AX25",
297 "_xmit_PRONET", "_xmit_CHAOS", "_xmit_IEEE802", "_xmit_ARCNET",
298 "_xmit_APPLETLK", "_xmit_DLCI", "_xmit_ATM", "_xmit_METRICOM",
299 "_xmit_IEEE1394", "_xmit_EUI64", "_xmit_INFINIBAND", "_xmit_SLIP",
300 "_xmit_CSLIP", "_xmit_SLIP6", "_xmit_CSLIP6", "_xmit_RSRVD",
301 "_xmit_ADAPT", "_xmit_ROSE", "_xmit_X25", "_xmit_HWX25",
302 "_xmit_PPP", "_xmit_CISCO", "_xmit_LAPB", "_xmit_DDCMP",
303 "_xmit_RAWHDLC", "_xmit_TUNNEL", "_xmit_TUNNEL6", "_xmit_FRAD",
304 "_xmit_SKIP", "_xmit_LOOPBACK", "_xmit_LOCALTLK", "_xmit_FDDI",
305 "_xmit_BIF", "_xmit_SIT", "_xmit_IPDDP", "_xmit_IPGRE",
306 "_xmit_PIMREG", "_xmit_HIPPI", "_xmit_ASH", "_xmit_ECONET",
307 "_xmit_IRDA", "_xmit_FCPP", "_xmit_FCAL", "_xmit_FCPL",
308 "_xmit_FCFABRIC", "_xmit_IEEE80211", "_xmit_IEEE80211_PRISM",
309 "_xmit_IEEE80211_RADIOTAP", "_xmit_PHONET", "_xmit_PHONET_PIPE",
310 "_xmit_IEEE802154", "_xmit_VOID", "_xmit_NONE"};
312 static struct lock_class_key netdev_xmit_lock_key[ARRAY_SIZE(netdev_lock_type)];
313 static struct lock_class_key netdev_addr_lock_key[ARRAY_SIZE(netdev_lock_type)];
315 static inline unsigned short netdev_lock_pos(unsigned short dev_type)
319 for (i = 0; i < ARRAY_SIZE(netdev_lock_type); i++)
320 if (netdev_lock_type[i] == dev_type)
322 /* the last key is used by default */
323 return ARRAY_SIZE(netdev_lock_type) - 1;
326 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
327 unsigned short dev_type)
331 i = netdev_lock_pos(dev_type);
332 lockdep_set_class_and_name(lock, &netdev_xmit_lock_key[i],
333 netdev_lock_name[i]);
336 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
340 i = netdev_lock_pos(dev->type);
341 lockdep_set_class_and_name(&dev->addr_list_lock,
342 &netdev_addr_lock_key[i],
343 netdev_lock_name[i]);
346 static inline void netdev_set_xmit_lockdep_class(spinlock_t *lock,
347 unsigned short dev_type)
350 static inline void netdev_set_addr_lockdep_class(struct net_device *dev)
355 /*******************************************************************************
357 Protocol management and registration routines
359 *******************************************************************************/
362 * Add a protocol ID to the list. Now that the input handler is
363 * smarter we can dispense with all the messy stuff that used to be
366 * BEWARE!!! Protocol handlers, mangling input packets,
367 * MUST BE last in hash buckets and checking protocol handlers
368 * MUST start from promiscuous ptype_all chain in net_bh.
369 * It is true now, do not change it.
370 * Explanation follows: if protocol handler, mangling packet, will
371 * be the first on list, it is not able to sense, that packet
372 * is cloned and should be copied-on-write, so that it will
373 * change it and subsequent readers will get broken packet.
377 static inline struct list_head *ptype_head(const struct packet_type *pt)
379 if (pt->type == htons(ETH_P_ALL))
380 return pt->dev ? &pt->dev->ptype_all : &ptype_all;
382 return pt->dev ? &pt->dev->ptype_specific :
383 &ptype_base[ntohs(pt->type) & PTYPE_HASH_MASK];
387 * dev_add_pack - add packet handler
388 * @pt: packet type declaration
390 * Add a protocol handler to the networking stack. The passed &packet_type
391 * is linked into kernel lists and may not be freed until it has been
392 * removed from the kernel lists.
394 * This call does not sleep therefore it can not
395 * guarantee all CPU's that are in middle of receiving packets
396 * will see the new packet type (until the next received packet).
399 void dev_add_pack(struct packet_type *pt)
401 struct list_head *head = ptype_head(pt);
403 spin_lock(&ptype_lock);
404 list_add_rcu(&pt->list, head);
405 spin_unlock(&ptype_lock);
407 EXPORT_SYMBOL(dev_add_pack);
410 * __dev_remove_pack - remove packet handler
411 * @pt: packet type declaration
413 * Remove a protocol handler that was previously added to the kernel
414 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
415 * from the kernel lists and can be freed or reused once this function
418 * The packet type might still be in use by receivers
419 * and must not be freed until after all the CPU's have gone
420 * through a quiescent state.
422 void __dev_remove_pack(struct packet_type *pt)
424 struct list_head *head = ptype_head(pt);
425 struct packet_type *pt1;
427 spin_lock(&ptype_lock);
429 list_for_each_entry(pt1, head, list) {
431 list_del_rcu(&pt->list);
436 pr_warn("dev_remove_pack: %p not found\n", pt);
438 spin_unlock(&ptype_lock);
440 EXPORT_SYMBOL(__dev_remove_pack);
443 * dev_remove_pack - remove packet handler
444 * @pt: packet type declaration
446 * Remove a protocol handler that was previously added to the kernel
447 * protocol handlers by dev_add_pack(). The passed &packet_type is removed
448 * from the kernel lists and can be freed or reused once this function
451 * This call sleeps to guarantee that no CPU is looking at the packet
454 void dev_remove_pack(struct packet_type *pt)
456 __dev_remove_pack(pt);
460 EXPORT_SYMBOL(dev_remove_pack);
464 * dev_add_offload - register offload handlers
465 * @po: protocol offload declaration
467 * Add protocol offload handlers to the networking stack. The passed
468 * &proto_offload is linked into kernel lists and may not be freed until
469 * it has been removed from the kernel lists.
471 * This call does not sleep therefore it can not
472 * guarantee all CPU's that are in middle of receiving packets
473 * will see the new offload handlers (until the next received packet).
475 void dev_add_offload(struct packet_offload *po)
477 struct packet_offload *elem;
479 spin_lock(&offload_lock);
480 list_for_each_entry(elem, &offload_base, list) {
481 if (po->priority < elem->priority)
484 list_add_rcu(&po->list, elem->list.prev);
485 spin_unlock(&offload_lock);
487 EXPORT_SYMBOL(dev_add_offload);
490 * __dev_remove_offload - remove offload handler
491 * @po: packet offload declaration
493 * Remove a protocol offload handler that was previously added to the
494 * kernel offload handlers by dev_add_offload(). The passed &offload_type
495 * is removed from the kernel lists and can be freed or reused once this
498 * The packet type might still be in use by receivers
499 * and must not be freed until after all the CPU's have gone
500 * through a quiescent state.
502 static void __dev_remove_offload(struct packet_offload *po)
504 struct list_head *head = &offload_base;
505 struct packet_offload *po1;
507 spin_lock(&offload_lock);
509 list_for_each_entry(po1, head, list) {
511 list_del_rcu(&po->list);
516 pr_warn("dev_remove_offload: %p not found\n", po);
518 spin_unlock(&offload_lock);
522 * dev_remove_offload - remove packet offload handler
523 * @po: packet offload declaration
525 * Remove a packet offload handler that was previously added to the kernel
526 * offload handlers by dev_add_offload(). The passed &offload_type is
527 * removed from the kernel lists and can be freed or reused once this
530 * This call sleeps to guarantee that no CPU is looking at the packet
533 void dev_remove_offload(struct packet_offload *po)
535 __dev_remove_offload(po);
539 EXPORT_SYMBOL(dev_remove_offload);
541 /******************************************************************************
543 Device Boot-time Settings Routines
545 *******************************************************************************/
547 /* Boot time configuration table */
548 static struct netdev_boot_setup dev_boot_setup[NETDEV_BOOT_SETUP_MAX];
551 * netdev_boot_setup_add - add new setup entry
552 * @name: name of the device
553 * @map: configured settings for the device
555 * Adds new setup entry to the dev_boot_setup list. The function
556 * returns 0 on error and 1 on success. This is a generic routine to
559 static int netdev_boot_setup_add(char *name, struct ifmap *map)
561 struct netdev_boot_setup *s;
565 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
566 if (s[i].name[0] == '\0' || s[i].name[0] == ' ') {
567 memset(s[i].name, 0, sizeof(s[i].name));
568 strlcpy(s[i].name, name, IFNAMSIZ);
569 memcpy(&s[i].map, map, sizeof(s[i].map));
574 return i >= NETDEV_BOOT_SETUP_MAX ? 0 : 1;
578 * netdev_boot_setup_check - check boot time settings
579 * @dev: the netdevice
581 * Check boot time settings for the device.
582 * The found settings are set for the device to be used
583 * later in the device probing.
584 * Returns 0 if no settings found, 1 if they are.
586 int netdev_boot_setup_check(struct net_device *dev)
588 struct netdev_boot_setup *s = dev_boot_setup;
591 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++) {
592 if (s[i].name[0] != '\0' && s[i].name[0] != ' ' &&
593 !strcmp(dev->name, s[i].name)) {
594 dev->irq = s[i].map.irq;
595 dev->base_addr = s[i].map.base_addr;
596 dev->mem_start = s[i].map.mem_start;
597 dev->mem_end = s[i].map.mem_end;
603 EXPORT_SYMBOL(netdev_boot_setup_check);
607 * netdev_boot_base - get address from boot time settings
608 * @prefix: prefix for network device
609 * @unit: id for network device
611 * Check boot time settings for the base address of device.
612 * The found settings are set for the device to be used
613 * later in the device probing.
614 * Returns 0 if no settings found.
616 unsigned long netdev_boot_base(const char *prefix, int unit)
618 const struct netdev_boot_setup *s = dev_boot_setup;
622 sprintf(name, "%s%d", prefix, unit);
625 * If device already registered then return base of 1
626 * to indicate not to probe for this interface
628 if (__dev_get_by_name(&init_net, name))
631 for (i = 0; i < NETDEV_BOOT_SETUP_MAX; i++)
632 if (!strcmp(name, s[i].name))
633 return s[i].map.base_addr;
638 * Saves at boot time configured settings for any netdevice.
640 int __init netdev_boot_setup(char *str)
645 str = get_options(str, ARRAY_SIZE(ints), ints);
650 memset(&map, 0, sizeof(map));
654 map.base_addr = ints[2];
656 map.mem_start = ints[3];
658 map.mem_end = ints[4];
660 /* Add new entry to the list */
661 return netdev_boot_setup_add(str, &map);
664 __setup("netdev=", netdev_boot_setup);
666 /*******************************************************************************
668 Device Interface Subroutines
670 *******************************************************************************/
673 * dev_get_iflink - get 'iflink' value of a interface
674 * @dev: targeted interface
676 * Indicates the ifindex the interface is linked to.
677 * Physical interfaces have the same 'ifindex' and 'iflink' values.
680 int dev_get_iflink(const struct net_device *dev)
682 if (dev->netdev_ops && dev->netdev_ops->ndo_get_iflink)
683 return dev->netdev_ops->ndo_get_iflink(dev);
687 EXPORT_SYMBOL(dev_get_iflink);
690 * dev_fill_metadata_dst - Retrieve tunnel egress information.
691 * @dev: targeted interface
694 * For better visibility of tunnel traffic OVS needs to retrieve
695 * egress tunnel information for a packet. Following API allows
696 * user to get this info.
698 int dev_fill_metadata_dst(struct net_device *dev, struct sk_buff *skb)
700 struct ip_tunnel_info *info;
702 if (!dev->netdev_ops || !dev->netdev_ops->ndo_fill_metadata_dst)
705 info = skb_tunnel_info_unclone(skb);
708 if (unlikely(!(info->mode & IP_TUNNEL_INFO_TX)))
711 return dev->netdev_ops->ndo_fill_metadata_dst(dev, skb);
713 EXPORT_SYMBOL_GPL(dev_fill_metadata_dst);
716 * __dev_get_by_name - find a device by its name
717 * @net: the applicable net namespace
718 * @name: name to find
720 * Find an interface by name. Must be called under RTNL semaphore
721 * or @dev_base_lock. If the name is found a pointer to the device
722 * is returned. If the name is not found then %NULL is returned. The
723 * reference counters are not incremented so the caller must be
724 * careful with locks.
727 struct net_device *__dev_get_by_name(struct net *net, const char *name)
729 struct net_device *dev;
730 struct hlist_head *head = dev_name_hash(net, name);
732 hlist_for_each_entry(dev, head, name_hlist)
733 if (!strncmp(dev->name, name, IFNAMSIZ))
738 EXPORT_SYMBOL(__dev_get_by_name);
741 * dev_get_by_name_rcu - find a device by its name
742 * @net: the applicable net namespace
743 * @name: name to find
745 * Find an interface by name.
746 * If the name is found a pointer to the device is returned.
747 * If the name is not found then %NULL is returned.
748 * The reference counters are not incremented so the caller must be
749 * careful with locks. The caller must hold RCU lock.
752 struct net_device *dev_get_by_name_rcu(struct net *net, const char *name)
754 struct net_device *dev;
755 struct hlist_head *head = dev_name_hash(net, name);
757 hlist_for_each_entry_rcu(dev, head, name_hlist)
758 if (!strncmp(dev->name, name, IFNAMSIZ))
763 EXPORT_SYMBOL(dev_get_by_name_rcu);
766 * dev_get_by_name - find a device by its name
767 * @net: the applicable net namespace
768 * @name: name to find
770 * Find an interface by name. This can be called from any
771 * context and does its own locking. The returned handle has
772 * the usage count incremented and the caller must use dev_put() to
773 * release it when it is no longer needed. %NULL is returned if no
774 * matching device is found.
777 struct net_device *dev_get_by_name(struct net *net, const char *name)
779 struct net_device *dev;
782 dev = dev_get_by_name_rcu(net, name);
788 EXPORT_SYMBOL(dev_get_by_name);
791 * __dev_get_by_index - find a device by its ifindex
792 * @net: the applicable net namespace
793 * @ifindex: index of device
795 * Search for an interface by index. Returns %NULL if the device
796 * is not found or a pointer to the device. The device has not
797 * had its reference counter increased so the caller must be careful
798 * about locking. The caller must hold either the RTNL semaphore
802 struct net_device *__dev_get_by_index(struct net *net, int ifindex)
804 struct net_device *dev;
805 struct hlist_head *head = dev_index_hash(net, ifindex);
807 hlist_for_each_entry(dev, head, index_hlist)
808 if (dev->ifindex == ifindex)
813 EXPORT_SYMBOL(__dev_get_by_index);
816 * dev_get_by_index_rcu - find a device by its ifindex
817 * @net: the applicable net namespace
818 * @ifindex: index of device
820 * Search for an interface by index. Returns %NULL if the device
821 * is not found or a pointer to the device. The device has not
822 * had its reference counter increased so the caller must be careful
823 * about locking. The caller must hold RCU lock.
826 struct net_device *dev_get_by_index_rcu(struct net *net, int ifindex)
828 struct net_device *dev;
829 struct hlist_head *head = dev_index_hash(net, ifindex);
831 hlist_for_each_entry_rcu(dev, head, index_hlist)
832 if (dev->ifindex == ifindex)
837 EXPORT_SYMBOL(dev_get_by_index_rcu);
841 * dev_get_by_index - find a device by its ifindex
842 * @net: the applicable net namespace
843 * @ifindex: index of device
845 * Search for an interface by index. Returns NULL if the device
846 * is not found or a pointer to the device. The device returned has
847 * had a reference added and the pointer is safe until the user calls
848 * dev_put to indicate they have finished with it.
851 struct net_device *dev_get_by_index(struct net *net, int ifindex)
853 struct net_device *dev;
856 dev = dev_get_by_index_rcu(net, ifindex);
862 EXPORT_SYMBOL(dev_get_by_index);
865 * netdev_get_name - get a netdevice name, knowing its ifindex.
866 * @net: network namespace
867 * @name: a pointer to the buffer where the name will be stored.
868 * @ifindex: the ifindex of the interface to get the name from.
870 * The use of raw_seqcount_begin() and cond_resched() before
871 * retrying is required as we want to give the writers a chance
872 * to complete when CONFIG_PREEMPT is not set.
874 int netdev_get_name(struct net *net, char *name, int ifindex)
876 struct net_device *dev;
880 seq = raw_seqcount_begin(&devnet_rename_seq);
882 dev = dev_get_by_index_rcu(net, ifindex);
888 strcpy(name, dev->name);
890 if (read_seqcount_retry(&devnet_rename_seq, seq)) {
899 * dev_getbyhwaddr_rcu - find a device by its hardware address
900 * @net: the applicable net namespace
901 * @type: media type of device
902 * @ha: hardware address
904 * Search for an interface by MAC address. Returns NULL if the device
905 * is not found or a pointer to the device.
906 * The caller must hold RCU or RTNL.
907 * The returned device has not had its ref count increased
908 * and the caller must therefore be careful about locking
912 struct net_device *dev_getbyhwaddr_rcu(struct net *net, unsigned short type,
915 struct net_device *dev;
917 for_each_netdev_rcu(net, dev)
918 if (dev->type == type &&
919 !memcmp(dev->dev_addr, ha, dev->addr_len))
924 EXPORT_SYMBOL(dev_getbyhwaddr_rcu);
926 struct net_device *__dev_getfirstbyhwtype(struct net *net, unsigned short type)
928 struct net_device *dev;
931 for_each_netdev(net, dev)
932 if (dev->type == type)
937 EXPORT_SYMBOL(__dev_getfirstbyhwtype);
939 struct net_device *dev_getfirstbyhwtype(struct net *net, unsigned short type)
941 struct net_device *dev, *ret = NULL;
944 for_each_netdev_rcu(net, dev)
945 if (dev->type == type) {
953 EXPORT_SYMBOL(dev_getfirstbyhwtype);
956 * __dev_get_by_flags - find any device with given flags
957 * @net: the applicable net namespace
958 * @if_flags: IFF_* values
959 * @mask: bitmask of bits in if_flags to check
961 * Search for any interface with the given flags. Returns NULL if a device
962 * is not found or a pointer to the device. Must be called inside
963 * rtnl_lock(), and result refcount is unchanged.
966 struct net_device *__dev_get_by_flags(struct net *net, unsigned short if_flags,
969 struct net_device *dev, *ret;
974 for_each_netdev(net, dev) {
975 if (((dev->flags ^ if_flags) & mask) == 0) {
982 EXPORT_SYMBOL(__dev_get_by_flags);
985 * dev_valid_name - check if name is okay for network device
988 * Network device names need to be valid file names to
989 * to allow sysfs to work. We also disallow any kind of
992 bool dev_valid_name(const char *name)
996 if (strlen(name) >= IFNAMSIZ)
998 if (!strcmp(name, ".") || !strcmp(name, ".."))
1002 if (*name == '/' || *name == ':' || isspace(*name))
1008 EXPORT_SYMBOL(dev_valid_name);
1011 * __dev_alloc_name - allocate a name for a device
1012 * @net: network namespace to allocate the device name in
1013 * @name: name format string
1014 * @buf: scratch buffer and result name string
1016 * Passed a format string - eg "lt%d" it will try and find a suitable
1017 * id. It scans list of devices to build up a free map, then chooses
1018 * the first empty slot. The caller must hold the dev_base or rtnl lock
1019 * while allocating the name and adding the device in order to avoid
1021 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1022 * Returns the number of the unit assigned or a negative errno code.
1025 static int __dev_alloc_name(struct net *net, const char *name, char *buf)
1029 const int max_netdevices = 8*PAGE_SIZE;
1030 unsigned long *inuse;
1031 struct net_device *d;
1033 p = strnchr(name, IFNAMSIZ-1, '%');
1036 * Verify the string as this thing may have come from
1037 * the user. There must be either one "%d" and no other "%"
1040 if (p[1] != 'd' || strchr(p + 2, '%'))
1043 /* Use one page as a bit array of possible slots */
1044 inuse = (unsigned long *) get_zeroed_page(GFP_ATOMIC);
1048 for_each_netdev(net, d) {
1049 if (!sscanf(d->name, name, &i))
1051 if (i < 0 || i >= max_netdevices)
1054 /* avoid cases where sscanf is not exact inverse of printf */
1055 snprintf(buf, IFNAMSIZ, name, i);
1056 if (!strncmp(buf, d->name, IFNAMSIZ))
1060 i = find_first_zero_bit(inuse, max_netdevices);
1061 free_page((unsigned long) inuse);
1065 snprintf(buf, IFNAMSIZ, name, i);
1066 if (!__dev_get_by_name(net, buf))
1069 /* It is possible to run out of possible slots
1070 * when the name is long and there isn't enough space left
1071 * for the digits, or if all bits are used.
1077 * dev_alloc_name - allocate a name for a device
1079 * @name: name format string
1081 * Passed a format string - eg "lt%d" it will try and find a suitable
1082 * id. It scans list of devices to build up a free map, then chooses
1083 * the first empty slot. The caller must hold the dev_base or rtnl lock
1084 * while allocating the name and adding the device in order to avoid
1086 * Limited to bits_per_byte * page size devices (ie 32K on most platforms).
1087 * Returns the number of the unit assigned or a negative errno code.
1090 int dev_alloc_name(struct net_device *dev, const char *name)
1096 BUG_ON(!dev_net(dev));
1098 ret = __dev_alloc_name(net, name, buf);
1100 strlcpy(dev->name, buf, IFNAMSIZ);
1103 EXPORT_SYMBOL(dev_alloc_name);
1105 static int dev_alloc_name_ns(struct net *net,
1106 struct net_device *dev,
1112 ret = __dev_alloc_name(net, name, buf);
1114 strlcpy(dev->name, buf, IFNAMSIZ);
1118 static int dev_get_valid_name(struct net *net,
1119 struct net_device *dev,
1124 if (!dev_valid_name(name))
1127 if (strchr(name, '%'))
1128 return dev_alloc_name_ns(net, dev, name);
1129 else if (__dev_get_by_name(net, name))
1131 else if (dev->name != name)
1132 strlcpy(dev->name, name, IFNAMSIZ);
1138 * dev_change_name - change name of a device
1140 * @newname: name (or format string) must be at least IFNAMSIZ
1142 * Change name of a device, can pass format strings "eth%d".
1145 int dev_change_name(struct net_device *dev, const char *newname)
1147 unsigned char old_assign_type;
1148 char oldname[IFNAMSIZ];
1154 BUG_ON(!dev_net(dev));
1157 if (dev->flags & IFF_UP)
1160 write_seqcount_begin(&devnet_rename_seq);
1162 if (strncmp(newname, dev->name, IFNAMSIZ) == 0) {
1163 write_seqcount_end(&devnet_rename_seq);
1167 memcpy(oldname, dev->name, IFNAMSIZ);
1169 err = dev_get_valid_name(net, dev, newname);
1171 write_seqcount_end(&devnet_rename_seq);
1175 if (oldname[0] && !strchr(oldname, '%'))
1176 netdev_info(dev, "renamed from %s\n", oldname);
1178 old_assign_type = dev->name_assign_type;
1179 dev->name_assign_type = NET_NAME_RENAMED;
1182 ret = device_rename(&dev->dev, dev->name);
1184 memcpy(dev->name, oldname, IFNAMSIZ);
1185 dev->name_assign_type = old_assign_type;
1186 write_seqcount_end(&devnet_rename_seq);
1190 write_seqcount_end(&devnet_rename_seq);
1192 netdev_adjacent_rename_links(dev, oldname);
1194 write_lock_bh(&dev_base_lock);
1195 hlist_del_rcu(&dev->name_hlist);
1196 write_unlock_bh(&dev_base_lock);
1200 write_lock_bh(&dev_base_lock);
1201 hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
1202 write_unlock_bh(&dev_base_lock);
1204 ret = call_netdevice_notifiers(NETDEV_CHANGENAME, dev);
1205 ret = notifier_to_errno(ret);
1208 /* err >= 0 after dev_alloc_name() or stores the first errno */
1211 write_seqcount_begin(&devnet_rename_seq);
1212 memcpy(dev->name, oldname, IFNAMSIZ);
1213 memcpy(oldname, newname, IFNAMSIZ);
1214 dev->name_assign_type = old_assign_type;
1215 old_assign_type = NET_NAME_RENAMED;
1218 pr_err("%s: name change rollback failed: %d\n",
1227 * dev_set_alias - change ifalias of a device
1229 * @alias: name up to IFALIASZ
1230 * @len: limit of bytes to copy from info
1232 * Set ifalias for a device,
1234 int dev_set_alias(struct net_device *dev, const char *alias, size_t len)
1240 if (len >= IFALIASZ)
1244 kfree(dev->ifalias);
1245 dev->ifalias = NULL;
1249 new_ifalias = krealloc(dev->ifalias, len + 1, GFP_KERNEL);
1252 dev->ifalias = new_ifalias;
1254 strlcpy(dev->ifalias, alias, len+1);
1260 * netdev_features_change - device changes features
1261 * @dev: device to cause notification
1263 * Called to indicate a device has changed features.
1265 void netdev_features_change(struct net_device *dev)
1267 call_netdevice_notifiers(NETDEV_FEAT_CHANGE, dev);
1269 EXPORT_SYMBOL(netdev_features_change);
1272 * netdev_state_change - device changes state
1273 * @dev: device to cause notification
1275 * Called to indicate a device has changed state. This function calls
1276 * the notifier chains for netdev_chain and sends a NEWLINK message
1277 * to the routing socket.
1279 void netdev_state_change(struct net_device *dev)
1281 if (dev->flags & IFF_UP) {
1282 struct netdev_notifier_change_info change_info;
1284 change_info.flags_changed = 0;
1285 call_netdevice_notifiers_info(NETDEV_CHANGE, dev,
1287 rtmsg_ifinfo(RTM_NEWLINK, dev, 0, GFP_KERNEL);
1290 EXPORT_SYMBOL(netdev_state_change);
1293 * netdev_notify_peers - notify network peers about existence of @dev
1294 * @dev: network device
1296 * Generate traffic such that interested network peers are aware of
1297 * @dev, such as by generating a gratuitous ARP. This may be used when
1298 * a device wants to inform the rest of the network about some sort of
1299 * reconfiguration such as a failover event or virtual machine
1302 void netdev_notify_peers(struct net_device *dev)
1305 call_netdevice_notifiers(NETDEV_NOTIFY_PEERS, dev);
1308 EXPORT_SYMBOL(netdev_notify_peers);
1310 static int __dev_open(struct net_device *dev)
1312 const struct net_device_ops *ops = dev->netdev_ops;
1317 if (!netif_device_present(dev))
1320 /* Block netpoll from trying to do any rx path servicing.
1321 * If we don't do this there is a chance ndo_poll_controller
1322 * or ndo_poll may be running while we open the device
1324 netpoll_poll_disable(dev);
1326 ret = call_netdevice_notifiers(NETDEV_PRE_UP, dev);
1327 ret = notifier_to_errno(ret);
1331 set_bit(__LINK_STATE_START, &dev->state);
1333 if (ops->ndo_validate_addr)
1334 ret = ops->ndo_validate_addr(dev);
1336 if (!ret && ops->ndo_open)
1337 ret = ops->ndo_open(dev);
1339 netpoll_poll_enable(dev);
1342 clear_bit(__LINK_STATE_START, &dev->state);
1344 dev->flags |= IFF_UP;
1345 dev_set_rx_mode(dev);
1347 add_device_randomness(dev->dev_addr, dev->addr_len);
1354 * dev_open - prepare an interface for use.
1355 * @dev: device to open
1357 * Takes a device from down to up state. The device's private open
1358 * function is invoked and then the multicast lists are loaded. Finally
1359 * the device is moved into the up state and a %NETDEV_UP message is
1360 * sent to the netdev notifier chain.
1362 * Calling this function on an active interface is a nop. On a failure
1363 * a negative errno code is returned.
1365 int dev_open(struct net_device *dev)
1369 if (dev->flags & IFF_UP)
1372 ret = __dev_open(dev);
1376 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
1377 call_netdevice_notifiers(NETDEV_UP, dev);
1381 EXPORT_SYMBOL(dev_open);
1383 static int __dev_close_many(struct list_head *head)
1385 struct net_device *dev;
1390 list_for_each_entry(dev, head, close_list) {
1391 /* Temporarily disable netpoll until the interface is down */
1392 netpoll_poll_disable(dev);
1394 call_netdevice_notifiers(NETDEV_GOING_DOWN, dev);
1396 clear_bit(__LINK_STATE_START, &dev->state);
1398 /* Synchronize to scheduled poll. We cannot touch poll list, it
1399 * can be even on different cpu. So just clear netif_running().
1401 * dev->stop() will invoke napi_disable() on all of it's
1402 * napi_struct instances on this device.
1404 smp_mb__after_atomic(); /* Commit netif_running(). */
1407 dev_deactivate_many(head);
1409 list_for_each_entry(dev, head, close_list) {
1410 const struct net_device_ops *ops = dev->netdev_ops;
1413 * Call the device specific close. This cannot fail.
1414 * Only if device is UP
1416 * We allow it to be called even after a DETACH hot-plug
1422 dev->flags &= ~IFF_UP;
1423 netpoll_poll_enable(dev);
1429 static int __dev_close(struct net_device *dev)
1434 list_add(&dev->close_list, &single);
1435 retval = __dev_close_many(&single);
1441 int dev_close_many(struct list_head *head, bool unlink)
1443 struct net_device *dev, *tmp;
1445 /* Remove the devices that don't need to be closed */
1446 list_for_each_entry_safe(dev, tmp, head, close_list)
1447 if (!(dev->flags & IFF_UP))
1448 list_del_init(&dev->close_list);
1450 __dev_close_many(head);
1452 list_for_each_entry_safe(dev, tmp, head, close_list) {
1453 rtmsg_ifinfo(RTM_NEWLINK, dev, IFF_UP|IFF_RUNNING, GFP_KERNEL);
1454 call_netdevice_notifiers(NETDEV_DOWN, dev);
1456 list_del_init(&dev->close_list);
1461 EXPORT_SYMBOL(dev_close_many);
1464 * dev_close - shutdown an interface.
1465 * @dev: device to shutdown
1467 * This function moves an active device into down state. A
1468 * %NETDEV_GOING_DOWN is sent to the netdev notifier chain. The device
1469 * is then deactivated and finally a %NETDEV_DOWN is sent to the notifier
1472 int dev_close(struct net_device *dev)
1474 if (dev->flags & IFF_UP) {
1477 list_add(&dev->close_list, &single);
1478 dev_close_many(&single, true);
1483 EXPORT_SYMBOL(dev_close);
1487 * dev_disable_lro - disable Large Receive Offload on a device
1490 * Disable Large Receive Offload (LRO) on a net device. Must be
1491 * called under RTNL. This is needed if received packets may be
1492 * forwarded to another interface.
1494 void dev_disable_lro(struct net_device *dev)
1496 struct net_device *lower_dev;
1497 struct list_head *iter;
1499 dev->wanted_features &= ~NETIF_F_LRO;
1500 netdev_update_features(dev);
1502 if (unlikely(dev->features & NETIF_F_LRO))
1503 netdev_WARN(dev, "failed to disable LRO!\n");
1505 netdev_for_each_lower_dev(dev, lower_dev, iter)
1506 dev_disable_lro(lower_dev);
1508 EXPORT_SYMBOL(dev_disable_lro);
1510 static int call_netdevice_notifier(struct notifier_block *nb, unsigned long val,
1511 struct net_device *dev)
1513 struct netdev_notifier_info info;
1515 netdev_notifier_info_init(&info, dev);
1516 return nb->notifier_call(nb, val, &info);
1519 static int dev_boot_phase = 1;
1522 * register_netdevice_notifier - register a network notifier block
1525 * Register a notifier to be called when network device events occur.
1526 * The notifier passed is linked into the kernel structures and must
1527 * not be reused until it has been unregistered. A negative errno code
1528 * is returned on a failure.
1530 * When registered all registration and up events are replayed
1531 * to the new notifier to allow device to have a race free
1532 * view of the network device list.
1535 int register_netdevice_notifier(struct notifier_block *nb)
1537 struct net_device *dev;
1538 struct net_device *last;
1543 err = raw_notifier_chain_register(&netdev_chain, nb);
1549 for_each_netdev(net, dev) {
1550 err = call_netdevice_notifier(nb, NETDEV_REGISTER, dev);
1551 err = notifier_to_errno(err);
1555 if (!(dev->flags & IFF_UP))
1558 call_netdevice_notifier(nb, NETDEV_UP, dev);
1569 for_each_netdev(net, dev) {
1573 if (dev->flags & IFF_UP) {
1574 call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
1576 call_netdevice_notifier(nb, NETDEV_DOWN, dev);
1578 call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
1583 raw_notifier_chain_unregister(&netdev_chain, nb);
1586 EXPORT_SYMBOL(register_netdevice_notifier);
1589 * unregister_netdevice_notifier - unregister a network notifier block
1592 * Unregister a notifier previously registered by
1593 * register_netdevice_notifier(). The notifier is unlinked into the
1594 * kernel structures and may then be reused. A negative errno code
1595 * is returned on a failure.
1597 * After unregistering unregister and down device events are synthesized
1598 * for all devices on the device list to the removed notifier to remove
1599 * the need for special case cleanup code.
1602 int unregister_netdevice_notifier(struct notifier_block *nb)
1604 struct net_device *dev;
1609 err = raw_notifier_chain_unregister(&netdev_chain, nb);
1614 for_each_netdev(net, dev) {
1615 if (dev->flags & IFF_UP) {
1616 call_netdevice_notifier(nb, NETDEV_GOING_DOWN,
1618 call_netdevice_notifier(nb, NETDEV_DOWN, dev);
1620 call_netdevice_notifier(nb, NETDEV_UNREGISTER, dev);
1627 EXPORT_SYMBOL(unregister_netdevice_notifier);
1630 * call_netdevice_notifiers_info - call all network notifier blocks
1631 * @val: value passed unmodified to notifier function
1632 * @dev: net_device pointer passed unmodified to notifier function
1633 * @info: notifier information data
1635 * Call all network notifier blocks. Parameters and return value
1636 * are as for raw_notifier_call_chain().
1639 static int call_netdevice_notifiers_info(unsigned long val,
1640 struct net_device *dev,
1641 struct netdev_notifier_info *info)
1644 netdev_notifier_info_init(info, dev);
1645 return raw_notifier_call_chain(&netdev_chain, val, info);
1649 * call_netdevice_notifiers - call all network notifier blocks
1650 * @val: value passed unmodified to notifier function
1651 * @dev: net_device pointer passed unmodified to notifier function
1653 * Call all network notifier blocks. Parameters and return value
1654 * are as for raw_notifier_call_chain().
1657 int call_netdevice_notifiers(unsigned long val, struct net_device *dev)
1659 struct netdev_notifier_info info;
1661 return call_netdevice_notifiers_info(val, dev, &info);
1663 EXPORT_SYMBOL(call_netdevice_notifiers);
1665 #ifdef CONFIG_NET_INGRESS
1666 static struct static_key ingress_needed __read_mostly;
1668 void net_inc_ingress_queue(void)
1670 static_key_slow_inc(&ingress_needed);
1672 EXPORT_SYMBOL_GPL(net_inc_ingress_queue);
1674 void net_dec_ingress_queue(void)
1676 static_key_slow_dec(&ingress_needed);
1678 EXPORT_SYMBOL_GPL(net_dec_ingress_queue);
1681 #ifdef CONFIG_NET_EGRESS
1682 static struct static_key egress_needed __read_mostly;
1684 void net_inc_egress_queue(void)
1686 static_key_slow_inc(&egress_needed);
1688 EXPORT_SYMBOL_GPL(net_inc_egress_queue);
1690 void net_dec_egress_queue(void)
1692 static_key_slow_dec(&egress_needed);
1694 EXPORT_SYMBOL_GPL(net_dec_egress_queue);
1697 static struct static_key netstamp_needed __read_mostly;
1698 #ifdef HAVE_JUMP_LABEL
1699 /* We are not allowed to call static_key_slow_dec() from irq context
1700 * If net_disable_timestamp() is called from irq context, defer the
1701 * static_key_slow_dec() calls.
1703 static atomic_t netstamp_needed_deferred;
1706 void net_enable_timestamp(void)
1708 #ifdef HAVE_JUMP_LABEL
1709 int deferred = atomic_xchg(&netstamp_needed_deferred, 0);
1713 static_key_slow_dec(&netstamp_needed);
1717 static_key_slow_inc(&netstamp_needed);
1719 EXPORT_SYMBOL(net_enable_timestamp);
1721 void net_disable_timestamp(void)
1723 #ifdef HAVE_JUMP_LABEL
1724 if (in_interrupt()) {
1725 atomic_inc(&netstamp_needed_deferred);
1729 static_key_slow_dec(&netstamp_needed);
1731 EXPORT_SYMBOL(net_disable_timestamp);
1733 static inline void net_timestamp_set(struct sk_buff *skb)
1735 skb->tstamp.tv64 = 0;
1736 if (static_key_false(&netstamp_needed))
1737 __net_timestamp(skb);
1740 #define net_timestamp_check(COND, SKB) \
1741 if (static_key_false(&netstamp_needed)) { \
1742 if ((COND) && !(SKB)->tstamp.tv64) \
1743 __net_timestamp(SKB); \
1746 bool is_skb_forwardable(const struct net_device *dev, const struct sk_buff *skb)
1750 if (!(dev->flags & IFF_UP))
1753 len = dev->mtu + dev->hard_header_len + VLAN_HLEN;
1754 if (skb->len <= len)
1757 /* if TSO is enabled, we don't care about the length as the packet
1758 * could be forwarded without being segmented before
1760 if (skb_is_gso(skb))
1765 EXPORT_SYMBOL_GPL(is_skb_forwardable);
1767 int __dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1769 if (skb_orphan_frags(skb, GFP_ATOMIC) ||
1770 unlikely(!is_skb_forwardable(dev, skb))) {
1771 atomic_long_inc(&dev->rx_dropped);
1776 skb_scrub_packet(skb, true);
1778 skb->protocol = eth_type_trans(skb, dev);
1779 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
1783 EXPORT_SYMBOL_GPL(__dev_forward_skb);
1786 * dev_forward_skb - loopback an skb to another netif
1788 * @dev: destination network device
1789 * @skb: buffer to forward
1792 * NET_RX_SUCCESS (no congestion)
1793 * NET_RX_DROP (packet was dropped, but freed)
1795 * dev_forward_skb can be used for injecting an skb from the
1796 * start_xmit function of one device into the receive queue
1797 * of another device.
1799 * The receiving device may be in another namespace, so
1800 * we have to clear all information in the skb that could
1801 * impact namespace isolation.
1803 int dev_forward_skb(struct net_device *dev, struct sk_buff *skb)
1805 return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb);
1807 EXPORT_SYMBOL_GPL(dev_forward_skb);
1809 static inline int deliver_skb(struct sk_buff *skb,
1810 struct packet_type *pt_prev,
1811 struct net_device *orig_dev)
1813 if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
1815 atomic_inc(&skb->users);
1816 return pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
1819 static inline void deliver_ptype_list_skb(struct sk_buff *skb,
1820 struct packet_type **pt,
1821 struct net_device *orig_dev,
1823 struct list_head *ptype_list)
1825 struct packet_type *ptype, *pt_prev = *pt;
1827 list_for_each_entry_rcu(ptype, ptype_list, list) {
1828 if (ptype->type != type)
1831 deliver_skb(skb, pt_prev, orig_dev);
1837 static inline bool skb_loop_sk(struct packet_type *ptype, struct sk_buff *skb)
1839 if (!ptype->af_packet_priv || !skb->sk)
1842 if (ptype->id_match)
1843 return ptype->id_match(ptype, skb->sk);
1844 else if ((struct sock *)ptype->af_packet_priv == skb->sk)
1851 * Support routine. Sends outgoing frames to any network
1852 * taps currently in use.
1855 void dev_queue_xmit_nit(struct sk_buff *skb, struct net_device *dev)
1857 struct packet_type *ptype;
1858 struct sk_buff *skb2 = NULL;
1859 struct packet_type *pt_prev = NULL;
1860 struct list_head *ptype_list = &ptype_all;
1864 list_for_each_entry_rcu(ptype, ptype_list, list) {
1865 /* Never send packets back to the socket
1866 * they originated from - MvS (miquels@drinkel.ow.org)
1868 if (skb_loop_sk(ptype, skb))
1872 deliver_skb(skb2, pt_prev, skb->dev);
1877 /* need to clone skb, done only once */
1878 skb2 = skb_clone(skb, GFP_ATOMIC);
1882 net_timestamp_set(skb2);
1884 /* skb->nh should be correctly
1885 * set by sender, so that the second statement is
1886 * just protection against buggy protocols.
1888 skb_reset_mac_header(skb2);
1890 if (skb_network_header(skb2) < skb2->data ||
1891 skb_network_header(skb2) > skb_tail_pointer(skb2)) {
1892 net_crit_ratelimited("protocol %04x is buggy, dev %s\n",
1893 ntohs(skb2->protocol),
1895 skb_reset_network_header(skb2);
1898 skb2->transport_header = skb2->network_header;
1899 skb2->pkt_type = PACKET_OUTGOING;
1903 if (ptype_list == &ptype_all) {
1904 ptype_list = &dev->ptype_all;
1909 pt_prev->func(skb2, skb->dev, pt_prev, skb->dev);
1912 EXPORT_SYMBOL_GPL(dev_queue_xmit_nit);
1915 * netif_setup_tc - Handle tc mappings on real_num_tx_queues change
1916 * @dev: Network device
1917 * @txq: number of queues available
1919 * If real_num_tx_queues is changed the tc mappings may no longer be
1920 * valid. To resolve this verify the tc mapping remains valid and if
1921 * not NULL the mapping. With no priorities mapping to this
1922 * offset/count pair it will no longer be used. In the worst case TC0
1923 * is invalid nothing can be done so disable priority mappings. If is
1924 * expected that drivers will fix this mapping if they can before
1925 * calling netif_set_real_num_tx_queues.
1927 static void netif_setup_tc(struct net_device *dev, unsigned int txq)
1930 struct netdev_tc_txq *tc = &dev->tc_to_txq[0];
1932 /* If TC0 is invalidated disable TC mapping */
1933 if (tc->offset + tc->count > txq) {
1934 pr_warn("Number of in use tx queues changed invalidating tc mappings. Priority traffic classification disabled!\n");
1939 /* Invalidated prio to tc mappings set to TC0 */
1940 for (i = 1; i < TC_BITMASK + 1; i++) {
1941 int q = netdev_get_prio_tc_map(dev, i);
1943 tc = &dev->tc_to_txq[q];
1944 if (tc->offset + tc->count > txq) {
1945 pr_warn("Number of in use tx queues changed. Priority %i to tc mapping %i is no longer valid. Setting map to 0\n",
1947 netdev_set_prio_tc_map(dev, i, 0);
1953 static DEFINE_MUTEX(xps_map_mutex);
1954 #define xmap_dereference(P) \
1955 rcu_dereference_protected((P), lockdep_is_held(&xps_map_mutex))
1957 static struct xps_map *remove_xps_queue(struct xps_dev_maps *dev_maps,
1960 struct xps_map *map = NULL;
1964 map = xmap_dereference(dev_maps->cpu_map[cpu]);
1966 for (pos = 0; map && pos < map->len; pos++) {
1967 if (map->queues[pos] == index) {
1969 map->queues[pos] = map->queues[--map->len];
1971 RCU_INIT_POINTER(dev_maps->cpu_map[cpu], NULL);
1972 kfree_rcu(map, rcu);
1982 static void netif_reset_xps_queues_gt(struct net_device *dev, u16 index)
1984 struct xps_dev_maps *dev_maps;
1986 bool active = false;
1988 mutex_lock(&xps_map_mutex);
1989 dev_maps = xmap_dereference(dev->xps_maps);
1994 for_each_possible_cpu(cpu) {
1995 for (i = index; i < dev->num_tx_queues; i++) {
1996 if (!remove_xps_queue(dev_maps, cpu, i))
1999 if (i == dev->num_tx_queues)
2004 RCU_INIT_POINTER(dev->xps_maps, NULL);
2005 kfree_rcu(dev_maps, rcu);
2008 for (i = index; i < dev->num_tx_queues; i++)
2009 netdev_queue_numa_node_write(netdev_get_tx_queue(dev, i),
2013 mutex_unlock(&xps_map_mutex);
2016 static struct xps_map *expand_xps_map(struct xps_map *map,
2019 struct xps_map *new_map;
2020 int alloc_len = XPS_MIN_MAP_ALLOC;
2023 for (pos = 0; map && pos < map->len; pos++) {
2024 if (map->queues[pos] != index)
2029 /* Need to add queue to this CPU's existing map */
2031 if (pos < map->alloc_len)
2034 alloc_len = map->alloc_len * 2;
2037 /* Need to allocate new map to store queue on this CPU's map */
2038 new_map = kzalloc_node(XPS_MAP_SIZE(alloc_len), GFP_KERNEL,
2043 for (i = 0; i < pos; i++)
2044 new_map->queues[i] = map->queues[i];
2045 new_map->alloc_len = alloc_len;
2051 int netif_set_xps_queue(struct net_device *dev, const struct cpumask *mask,
2054 struct xps_dev_maps *dev_maps, *new_dev_maps = NULL;
2055 struct xps_map *map, *new_map;
2056 int maps_sz = max_t(unsigned int, XPS_DEV_MAPS_SIZE, L1_CACHE_BYTES);
2057 int cpu, numa_node_id = -2;
2058 bool active = false;
2060 mutex_lock(&xps_map_mutex);
2062 dev_maps = xmap_dereference(dev->xps_maps);
2064 /* allocate memory for queue storage */
2065 for_each_online_cpu(cpu) {
2066 if (!cpumask_test_cpu(cpu, mask))
2070 new_dev_maps = kzalloc(maps_sz, GFP_KERNEL);
2071 if (!new_dev_maps) {
2072 mutex_unlock(&xps_map_mutex);
2076 map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) :
2079 map = expand_xps_map(map, cpu, index);
2083 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map);
2087 goto out_no_new_maps;
2089 for_each_possible_cpu(cpu) {
2090 if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu)) {
2091 /* add queue to CPU maps */
2094 map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
2095 while ((pos < map->len) && (map->queues[pos] != index))
2098 if (pos == map->len)
2099 map->queues[map->len++] = index;
2101 if (numa_node_id == -2)
2102 numa_node_id = cpu_to_node(cpu);
2103 else if (numa_node_id != cpu_to_node(cpu))
2106 } else if (dev_maps) {
2107 /* fill in the new device map from the old device map */
2108 map = xmap_dereference(dev_maps->cpu_map[cpu]);
2109 RCU_INIT_POINTER(new_dev_maps->cpu_map[cpu], map);
2114 rcu_assign_pointer(dev->xps_maps, new_dev_maps);
2116 /* Cleanup old maps */
2118 for_each_possible_cpu(cpu) {
2119 new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
2120 map = xmap_dereference(dev_maps->cpu_map[cpu]);
2121 if (map && map != new_map)
2122 kfree_rcu(map, rcu);
2125 kfree_rcu(dev_maps, rcu);
2128 dev_maps = new_dev_maps;
2132 /* update Tx queue numa node */
2133 netdev_queue_numa_node_write(netdev_get_tx_queue(dev, index),
2134 (numa_node_id >= 0) ? numa_node_id :
2140 /* removes queue from unused CPUs */
2141 for_each_possible_cpu(cpu) {
2142 if (cpumask_test_cpu(cpu, mask) && cpu_online(cpu))
2145 if (remove_xps_queue(dev_maps, cpu, index))
2149 /* free map if not active */
2151 RCU_INIT_POINTER(dev->xps_maps, NULL);
2152 kfree_rcu(dev_maps, rcu);
2156 mutex_unlock(&xps_map_mutex);
2160 /* remove any maps that we added */
2161 for_each_possible_cpu(cpu) {
2162 new_map = xmap_dereference(new_dev_maps->cpu_map[cpu]);
2163 map = dev_maps ? xmap_dereference(dev_maps->cpu_map[cpu]) :
2165 if (new_map && new_map != map)
2169 mutex_unlock(&xps_map_mutex);
2171 kfree(new_dev_maps);
2174 EXPORT_SYMBOL(netif_set_xps_queue);
2178 * Routine to help set real_num_tx_queues. To avoid skbs mapped to queues
2179 * greater then real_num_tx_queues stale skbs on the qdisc must be flushed.
2181 int netif_set_real_num_tx_queues(struct net_device *dev, unsigned int txq)
2185 if (txq < 1 || txq > dev->num_tx_queues)
2188 if (dev->reg_state == NETREG_REGISTERED ||
2189 dev->reg_state == NETREG_UNREGISTERING) {
2192 rc = netdev_queue_update_kobjects(dev, dev->real_num_tx_queues,
2198 netif_setup_tc(dev, txq);
2200 if (txq < dev->real_num_tx_queues) {
2201 qdisc_reset_all_tx_gt(dev, txq);
2203 netif_reset_xps_queues_gt(dev, txq);
2208 dev->real_num_tx_queues = txq;
2211 EXPORT_SYMBOL(netif_set_real_num_tx_queues);
2215 * netif_set_real_num_rx_queues - set actual number of RX queues used
2216 * @dev: Network device
2217 * @rxq: Actual number of RX queues
2219 * This must be called either with the rtnl_lock held or before
2220 * registration of the net device. Returns 0 on success, or a
2221 * negative error code. If called before registration, it always
2224 int netif_set_real_num_rx_queues(struct net_device *dev, unsigned int rxq)
2228 if (rxq < 1 || rxq > dev->num_rx_queues)
2231 if (dev->reg_state == NETREG_REGISTERED) {
2234 rc = net_rx_queue_update_kobjects(dev, dev->real_num_rx_queues,
2240 dev->real_num_rx_queues = rxq;
2243 EXPORT_SYMBOL(netif_set_real_num_rx_queues);
2247 * netif_get_num_default_rss_queues - default number of RSS queues
2249 * This routine should set an upper limit on the number of RSS queues
2250 * used by default by multiqueue devices.
2252 int netif_get_num_default_rss_queues(void)
2254 return is_kdump_kernel() ?
2255 1 : min_t(int, DEFAULT_MAX_NUM_RSS_QUEUES, num_online_cpus());
2257 EXPORT_SYMBOL(netif_get_num_default_rss_queues);
2259 static void __netif_reschedule(struct Qdisc *q)
2261 struct softnet_data *sd;
2262 unsigned long flags;
2264 local_irq_save(flags);
2265 sd = this_cpu_ptr(&softnet_data);
2266 q->next_sched = NULL;
2267 *sd->output_queue_tailp = q;
2268 sd->output_queue_tailp = &q->next_sched;
2269 raise_softirq_irqoff(NET_TX_SOFTIRQ);
2270 local_irq_restore(flags);
2273 void __netif_schedule(struct Qdisc *q)
2275 if (!test_and_set_bit(__QDISC_STATE_SCHED, &q->state))
2276 __netif_reschedule(q);
2278 EXPORT_SYMBOL(__netif_schedule);
2280 struct dev_kfree_skb_cb {
2281 enum skb_free_reason reason;
2284 static struct dev_kfree_skb_cb *get_kfree_skb_cb(const struct sk_buff *skb)
2286 return (struct dev_kfree_skb_cb *)skb->cb;
2289 void netif_schedule_queue(struct netdev_queue *txq)
2292 if (!(txq->state & QUEUE_STATE_ANY_XOFF)) {
2293 struct Qdisc *q = rcu_dereference(txq->qdisc);
2295 __netif_schedule(q);
2299 EXPORT_SYMBOL(netif_schedule_queue);
2302 * netif_wake_subqueue - allow sending packets on subqueue
2303 * @dev: network device
2304 * @queue_index: sub queue index
2306 * Resume individual transmit queue of a device with multiple transmit queues.
2308 void netif_wake_subqueue(struct net_device *dev, u16 queue_index)
2310 struct netdev_queue *txq = netdev_get_tx_queue(dev, queue_index);
2312 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &txq->state)) {
2316 q = rcu_dereference(txq->qdisc);
2317 __netif_schedule(q);
2321 EXPORT_SYMBOL(netif_wake_subqueue);
2323 void netif_tx_wake_queue(struct netdev_queue *dev_queue)
2325 if (test_and_clear_bit(__QUEUE_STATE_DRV_XOFF, &dev_queue->state)) {
2329 q = rcu_dereference(dev_queue->qdisc);
2330 __netif_schedule(q);
2334 EXPORT_SYMBOL(netif_tx_wake_queue);
2336 void __dev_kfree_skb_irq(struct sk_buff *skb, enum skb_free_reason reason)
2338 unsigned long flags;
2340 if (likely(atomic_read(&skb->users) == 1)) {
2342 atomic_set(&skb->users, 0);
2343 } else if (likely(!atomic_dec_and_test(&skb->users))) {
2346 get_kfree_skb_cb(skb)->reason = reason;
2347 local_irq_save(flags);
2348 skb->next = __this_cpu_read(softnet_data.completion_queue);
2349 __this_cpu_write(softnet_data.completion_queue, skb);
2350 raise_softirq_irqoff(NET_TX_SOFTIRQ);
2351 local_irq_restore(flags);
2353 EXPORT_SYMBOL(__dev_kfree_skb_irq);
2355 void __dev_kfree_skb_any(struct sk_buff *skb, enum skb_free_reason reason)
2357 if (in_irq() || irqs_disabled())
2358 __dev_kfree_skb_irq(skb, reason);
2362 EXPORT_SYMBOL(__dev_kfree_skb_any);
2366 * netif_device_detach - mark device as removed
2367 * @dev: network device
2369 * Mark device as removed from system and therefore no longer available.
2371 void netif_device_detach(struct net_device *dev)
2373 if (test_and_clear_bit(__LINK_STATE_PRESENT, &dev->state) &&
2374 netif_running(dev)) {
2375 netif_tx_stop_all_queues(dev);
2378 EXPORT_SYMBOL(netif_device_detach);
2381 * netif_device_attach - mark device as attached
2382 * @dev: network device
2384 * Mark device as attached from system and restart if needed.
2386 void netif_device_attach(struct net_device *dev)
2388 if (!test_and_set_bit(__LINK_STATE_PRESENT, &dev->state) &&
2389 netif_running(dev)) {
2390 netif_tx_wake_all_queues(dev);
2391 __netdev_watchdog_up(dev);
2394 EXPORT_SYMBOL(netif_device_attach);
2397 * Returns a Tx hash based on the given packet descriptor a Tx queues' number
2398 * to be used as a distribution range.
2400 u16 __skb_tx_hash(const struct net_device *dev, struct sk_buff *skb,
2401 unsigned int num_tx_queues)
2405 u16 qcount = num_tx_queues;
2407 if (skb_rx_queue_recorded(skb)) {
2408 hash = skb_get_rx_queue(skb);
2409 while (unlikely(hash >= num_tx_queues))
2410 hash -= num_tx_queues;
2415 u8 tc = netdev_get_prio_tc_map(dev, skb->priority);
2416 qoffset = dev->tc_to_txq[tc].offset;
2417 qcount = dev->tc_to_txq[tc].count;
2420 return (u16) reciprocal_scale(skb_get_hash(skb), qcount) + qoffset;
2422 EXPORT_SYMBOL(__skb_tx_hash);
2424 static void skb_warn_bad_offload(const struct sk_buff *skb)
2426 static const netdev_features_t null_features;
2427 struct net_device *dev = skb->dev;
2428 const char *name = "";
2430 if (!net_ratelimit())
2434 if (dev->dev.parent)
2435 name = dev_driver_string(dev->dev.parent);
2437 name = netdev_name(dev);
2439 WARN(1, "%s: caps=(%pNF, %pNF) len=%d data_len=%d gso_size=%d "
2440 "gso_type=%d ip_summed=%d\n",
2441 name, dev ? &dev->features : &null_features,
2442 skb->sk ? &skb->sk->sk_route_caps : &null_features,
2443 skb->len, skb->data_len, skb_shinfo(skb)->gso_size,
2444 skb_shinfo(skb)->gso_type, skb->ip_summed);
2448 * Invalidate hardware checksum when packet is to be mangled, and
2449 * complete checksum manually on outgoing path.
2451 int skb_checksum_help(struct sk_buff *skb)
2454 int ret = 0, offset;
2456 if (skb->ip_summed == CHECKSUM_COMPLETE)
2457 goto out_set_summed;
2459 if (unlikely(skb_shinfo(skb)->gso_size)) {
2460 skb_warn_bad_offload(skb);
2464 /* Before computing a checksum, we should make sure no frag could
2465 * be modified by an external entity : checksum could be wrong.
2467 if (skb_has_shared_frag(skb)) {
2468 ret = __skb_linearize(skb);
2473 offset = skb_checksum_start_offset(skb);
2474 BUG_ON(offset >= skb_headlen(skb));
2475 csum = skb_checksum(skb, offset, skb->len - offset, 0);
2477 offset += skb->csum_offset;
2478 BUG_ON(offset + sizeof(__sum16) > skb_headlen(skb));
2480 if (skb_cloned(skb) &&
2481 !skb_clone_writable(skb, offset + sizeof(__sum16))) {
2482 ret = pskb_expand_head(skb, 0, 0, GFP_ATOMIC);
2487 *(__sum16 *)(skb->data + offset) = csum_fold(csum);
2489 skb->ip_summed = CHECKSUM_NONE;
2493 EXPORT_SYMBOL(skb_checksum_help);
2495 /* skb_csum_offload_check - Driver helper function to determine if a device
2496 * with limited checksum offload capabilities is able to offload the checksum
2497 * for a given packet.
2500 * skb - sk_buff for the packet in question
2501 * spec - contains the description of what device can offload
2502 * csum_encapped - returns true if the checksum being offloaded is
2503 * encpasulated. That is it is checksum for the transport header
2504 * in the inner headers.
2505 * checksum_help - when set indicates that helper function should
2506 * call skb_checksum_help if offload checks fail
2509 * true: Packet has passed the checksum checks and should be offloadable to
2510 * the device (a driver may still need to check for additional
2511 * restrictions of its device)
2512 * false: Checksum is not offloadable. If checksum_help was set then
2513 * skb_checksum_help was called to resolve checksum for non-GSO
2514 * packets and when IP protocol is not SCTP
2516 bool __skb_csum_offload_chk(struct sk_buff *skb,
2517 const struct skb_csum_offl_spec *spec,
2518 bool *csum_encapped,
2522 struct ipv6hdr *ipv6;
2527 if (skb->protocol == htons(ETH_P_8021Q) ||
2528 skb->protocol == htons(ETH_P_8021AD)) {
2529 if (!spec->vlan_okay)
2533 /* We check whether the checksum refers to a transport layer checksum in
2534 * the outermost header or an encapsulated transport layer checksum that
2535 * corresponds to the inner headers of the skb. If the checksum is for
2536 * something else in the packet we need help.
2538 if (skb_checksum_start_offset(skb) == skb_transport_offset(skb)) {
2539 /* Non-encapsulated checksum */
2540 protocol = eproto_to_ipproto(vlan_get_protocol(skb));
2541 nhdr = skb_network_header(skb);
2542 *csum_encapped = false;
2543 if (spec->no_not_encapped)
2545 } else if (skb->encapsulation && spec->encap_okay &&
2546 skb_checksum_start_offset(skb) ==
2547 skb_inner_transport_offset(skb)) {
2548 /* Encapsulated checksum */
2549 *csum_encapped = true;
2550 switch (skb->inner_protocol_type) {
2551 case ENCAP_TYPE_ETHER:
2552 protocol = eproto_to_ipproto(skb->inner_protocol);
2554 case ENCAP_TYPE_IPPROTO:
2555 protocol = skb->inner_protocol;
2558 nhdr = skb_inner_network_header(skb);
2565 if (!spec->ipv4_okay)
2568 ip_proto = iph->protocol;
2569 if (iph->ihl != 5 && !spec->ip_options_okay)
2573 if (!spec->ipv6_okay)
2575 if (spec->no_encapped_ipv6 && *csum_encapped)
2578 nhdr += sizeof(*ipv6);
2579 ip_proto = ipv6->nexthdr;
2588 if (!spec->tcp_okay ||
2589 skb->csum_offset != offsetof(struct tcphdr, check))
2593 if (!spec->udp_okay ||
2594 skb->csum_offset != offsetof(struct udphdr, check))
2598 if (!spec->sctp_okay ||
2599 skb->csum_offset != offsetof(struct sctphdr, checksum))
2603 case NEXTHDR_ROUTING:
2604 case NEXTHDR_DEST: {
2607 if (protocol != IPPROTO_IPV6 || !spec->ext_hdrs_okay)
2610 ip_proto = opthdr[0];
2611 nhdr += (opthdr[1] + 1) << 3;
2613 goto ip_proto_again;
2619 /* Passed the tests for offloading checksum */
2623 if (csum_help && !skb_shinfo(skb)->gso_size)
2624 skb_checksum_help(skb);
2628 EXPORT_SYMBOL(__skb_csum_offload_chk);
2630 __be16 skb_network_protocol(struct sk_buff *skb, int *depth)
2632 __be16 type = skb->protocol;
2634 /* Tunnel gso handlers can set protocol to ethernet. */
2635 if (type == htons(ETH_P_TEB)) {
2638 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
2641 eth = (struct ethhdr *)skb_mac_header(skb);
2642 type = eth->h_proto;
2645 return __vlan_get_protocol(skb, type, depth);
2649 * skb_mac_gso_segment - mac layer segmentation handler.
2650 * @skb: buffer to segment
2651 * @features: features for the output path (see dev->features)
2653 struct sk_buff *skb_mac_gso_segment(struct sk_buff *skb,
2654 netdev_features_t features)
2656 struct sk_buff *segs = ERR_PTR(-EPROTONOSUPPORT);
2657 struct packet_offload *ptype;
2658 int vlan_depth = skb->mac_len;
2659 __be16 type = skb_network_protocol(skb, &vlan_depth);
2661 if (unlikely(!type))
2662 return ERR_PTR(-EINVAL);
2664 __skb_pull(skb, vlan_depth);
2667 list_for_each_entry_rcu(ptype, &offload_base, list) {
2668 if (ptype->type == type && ptype->callbacks.gso_segment) {
2669 segs = ptype->callbacks.gso_segment(skb, features);
2675 __skb_push(skb, skb->data - skb_mac_header(skb));
2679 EXPORT_SYMBOL(skb_mac_gso_segment);
2682 /* openvswitch calls this on rx path, so we need a different check.
2684 static inline bool skb_needs_check(struct sk_buff *skb, bool tx_path)
2687 return skb->ip_summed != CHECKSUM_PARTIAL;
2689 return skb->ip_summed == CHECKSUM_NONE;
2693 * __skb_gso_segment - Perform segmentation on skb.
2694 * @skb: buffer to segment
2695 * @features: features for the output path (see dev->features)
2696 * @tx_path: whether it is called in TX path
2698 * This function segments the given skb and returns a list of segments.
2700 * It may return NULL if the skb requires no segmentation. This is
2701 * only possible when GSO is used for verifying header integrity.
2703 * Segmentation preserves SKB_SGO_CB_OFFSET bytes of previous skb cb.
2705 struct sk_buff *__skb_gso_segment(struct sk_buff *skb,
2706 netdev_features_t features, bool tx_path)
2708 if (unlikely(skb_needs_check(skb, tx_path))) {
2711 skb_warn_bad_offload(skb);
2713 err = skb_cow_head(skb, 0);
2715 return ERR_PTR(err);
2718 /* Only report GSO partial support if it will enable us to
2719 * support segmentation on this frame without needing additional
2722 if (features & NETIF_F_GSO_PARTIAL) {
2723 netdev_features_t partial_features = NETIF_F_GSO_ROBUST;
2724 struct net_device *dev = skb->dev;
2726 partial_features |= dev->features & dev->gso_partial_features;
2727 if (!skb_gso_ok(skb, features | partial_features))
2728 features &= ~NETIF_F_GSO_PARTIAL;
2731 BUILD_BUG_ON(SKB_SGO_CB_OFFSET +
2732 sizeof(*SKB_GSO_CB(skb)) > sizeof(skb->cb));
2734 SKB_GSO_CB(skb)->mac_offset = skb_headroom(skb);
2735 SKB_GSO_CB(skb)->encap_level = 0;
2737 skb_reset_mac_header(skb);
2738 skb_reset_mac_len(skb);
2740 return skb_mac_gso_segment(skb, features);
2742 EXPORT_SYMBOL(__skb_gso_segment);
2744 /* Take action when hardware reception checksum errors are detected. */
2746 void netdev_rx_csum_fault(struct net_device *dev)
2748 if (net_ratelimit()) {
2749 pr_err("%s: hw csum failure\n", dev ? dev->name : "<unknown>");
2753 EXPORT_SYMBOL(netdev_rx_csum_fault);
2756 /* Actually, we should eliminate this check as soon as we know, that:
2757 * 1. IOMMU is present and allows to map all the memory.
2758 * 2. No high memory really exists on this machine.
2761 static int illegal_highdma(struct net_device *dev, struct sk_buff *skb)
2763 #ifdef CONFIG_HIGHMEM
2765 if (!(dev->features & NETIF_F_HIGHDMA)) {
2766 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2767 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2768 if (PageHighMem(skb_frag_page(frag)))
2773 if (PCI_DMA_BUS_IS_PHYS) {
2774 struct device *pdev = dev->dev.parent;
2778 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
2779 skb_frag_t *frag = &skb_shinfo(skb)->frags[i];
2780 dma_addr_t addr = page_to_phys(skb_frag_page(frag));
2781 if (!pdev->dma_mask || addr + PAGE_SIZE - 1 > *pdev->dma_mask)
2789 /* If MPLS offload request, verify we are testing hardware MPLS features
2790 * instead of standard features for the netdev.
2792 #if IS_ENABLED(CONFIG_NET_MPLS_GSO)
2793 static netdev_features_t net_mpls_features(struct sk_buff *skb,
2794 netdev_features_t features,
2797 if (eth_p_mpls(type))
2798 features &= skb->dev->mpls_features;
2803 static netdev_features_t net_mpls_features(struct sk_buff *skb,
2804 netdev_features_t features,
2811 static netdev_features_t harmonize_features(struct sk_buff *skb,
2812 netdev_features_t features)
2817 type = skb_network_protocol(skb, &tmp);
2818 features = net_mpls_features(skb, features, type);
2820 if (skb->ip_summed != CHECKSUM_NONE &&
2821 !can_checksum_protocol(features, type)) {
2822 features &= ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
2823 } else if (illegal_highdma(skb->dev, skb)) {
2824 features &= ~NETIF_F_SG;
2830 netdev_features_t passthru_features_check(struct sk_buff *skb,
2831 struct net_device *dev,
2832 netdev_features_t features)
2836 EXPORT_SYMBOL(passthru_features_check);
2838 static netdev_features_t dflt_features_check(const struct sk_buff *skb,
2839 struct net_device *dev,
2840 netdev_features_t features)
2842 return vlan_features_check(skb, features);
2845 static netdev_features_t gso_features_check(const struct sk_buff *skb,
2846 struct net_device *dev,
2847 netdev_features_t features)
2849 u16 gso_segs = skb_shinfo(skb)->gso_segs;
2851 if (gso_segs > dev->gso_max_segs)
2852 return features & ~NETIF_F_GSO_MASK;
2854 /* Support for GSO partial features requires software
2855 * intervention before we can actually process the packets
2856 * so we need to strip support for any partial features now
2857 * and we can pull them back in after we have partially
2858 * segmented the frame.
2860 if (!(skb_shinfo(skb)->gso_type & SKB_GSO_PARTIAL))
2861 features &= ~dev->gso_partial_features;
2863 /* Make sure to clear the IPv4 ID mangling feature if the
2864 * IPv4 header has the potential to be fragmented.
2866 if (skb_shinfo(skb)->gso_type & SKB_GSO_TCPV4) {
2867 struct iphdr *iph = skb->encapsulation ?
2868 inner_ip_hdr(skb) : ip_hdr(skb);
2870 if (!(iph->frag_off & htons(IP_DF)))
2871 features &= ~NETIF_F_TSO_MANGLEID;
2877 netdev_features_t netif_skb_features(struct sk_buff *skb)
2879 struct net_device *dev = skb->dev;
2880 netdev_features_t features = dev->features;
2882 if (skb_is_gso(skb))
2883 features = gso_features_check(skb, dev, features);
2885 /* If encapsulation offload request, verify we are testing
2886 * hardware encapsulation features instead of standard
2887 * features for the netdev
2889 if (skb->encapsulation)
2890 features &= dev->hw_enc_features;
2892 if (skb_vlan_tagged(skb))
2893 features = netdev_intersect_features(features,
2894 dev->vlan_features |
2895 NETIF_F_HW_VLAN_CTAG_TX |
2896 NETIF_F_HW_VLAN_STAG_TX);
2898 if (dev->netdev_ops->ndo_features_check)
2899 features &= dev->netdev_ops->ndo_features_check(skb, dev,
2902 features &= dflt_features_check(skb, dev, features);
2904 return harmonize_features(skb, features);
2906 EXPORT_SYMBOL(netif_skb_features);
2908 static int xmit_one(struct sk_buff *skb, struct net_device *dev,
2909 struct netdev_queue *txq, bool more)
2914 if (!list_empty(&ptype_all) || !list_empty(&dev->ptype_all))
2915 dev_queue_xmit_nit(skb, dev);
2918 trace_net_dev_start_xmit(skb, dev);
2919 rc = netdev_start_xmit(skb, dev, txq, more);
2920 trace_net_dev_xmit(skb, rc, dev, len);
2925 struct sk_buff *dev_hard_start_xmit(struct sk_buff *first, struct net_device *dev,
2926 struct netdev_queue *txq, int *ret)
2928 struct sk_buff *skb = first;
2929 int rc = NETDEV_TX_OK;
2932 struct sk_buff *next = skb->next;
2935 rc = xmit_one(skb, dev, txq, next != NULL);
2936 if (unlikely(!dev_xmit_complete(rc))) {
2942 if (netif_xmit_stopped(txq) && skb) {
2943 rc = NETDEV_TX_BUSY;
2953 static struct sk_buff *validate_xmit_vlan(struct sk_buff *skb,
2954 netdev_features_t features)
2956 if (skb_vlan_tag_present(skb) &&
2957 !vlan_hw_offload_capable(features, skb->vlan_proto))
2958 skb = __vlan_hwaccel_push_inside(skb);
2962 static struct sk_buff *validate_xmit_skb(struct sk_buff *skb, struct net_device *dev)
2964 netdev_features_t features;
2966 features = netif_skb_features(skb);
2967 skb = validate_xmit_vlan(skb, features);
2971 if (netif_needs_gso(skb, features)) {
2972 struct sk_buff *segs;
2974 segs = skb_gso_segment(skb, features);
2982 if (skb_needs_linearize(skb, features) &&
2983 __skb_linearize(skb))
2986 /* If packet is not checksummed and device does not
2987 * support checksumming for this protocol, complete
2988 * checksumming here.
2990 if (skb->ip_summed == CHECKSUM_PARTIAL) {
2991 if (skb->encapsulation)
2992 skb_set_inner_transport_header(skb,
2993 skb_checksum_start_offset(skb));
2995 skb_set_transport_header(skb,
2996 skb_checksum_start_offset(skb));
2997 if (!(features & NETIF_F_CSUM_MASK) &&
2998 skb_checksum_help(skb))
3008 atomic_long_inc(&dev->tx_dropped);
3012 struct sk_buff *validate_xmit_skb_list(struct sk_buff *skb, struct net_device *dev)
3014 struct sk_buff *next, *head = NULL, *tail;
3016 for (; skb != NULL; skb = next) {
3020 /* in case skb wont be segmented, point to itself */
3023 skb = validate_xmit_skb(skb, dev);
3031 /* If skb was segmented, skb->prev points to
3032 * the last segment. If not, it still contains skb.
3039 static void qdisc_pkt_len_init(struct sk_buff *skb)
3041 const struct skb_shared_info *shinfo = skb_shinfo(skb);
3043 qdisc_skb_cb(skb)->pkt_len = skb->len;
3045 /* To get more precise estimation of bytes sent on wire,
3046 * we add to pkt_len the headers size of all segments
3048 if (shinfo->gso_size) {
3049 unsigned int hdr_len;
3050 u16 gso_segs = shinfo->gso_segs;
3052 /* mac layer + network layer */
3053 hdr_len = skb_transport_header(skb) - skb_mac_header(skb);
3055 /* + transport layer */
3056 if (likely(shinfo->gso_type & (SKB_GSO_TCPV4 | SKB_GSO_TCPV6)))
3057 hdr_len += tcp_hdrlen(skb);
3059 hdr_len += sizeof(struct udphdr);
3061 if (shinfo->gso_type & SKB_GSO_DODGY)
3062 gso_segs = DIV_ROUND_UP(skb->len - hdr_len,
3065 qdisc_skb_cb(skb)->pkt_len += (gso_segs - 1) * hdr_len;
3069 static inline int __dev_xmit_skb(struct sk_buff *skb, struct Qdisc *q,
3070 struct net_device *dev,
3071 struct netdev_queue *txq)
3073 spinlock_t *root_lock = qdisc_lock(q);
3074 struct sk_buff *to_free = NULL;
3078 qdisc_calculate_pkt_len(skb, q);
3080 * Heuristic to force contended enqueues to serialize on a
3081 * separate lock before trying to get qdisc main lock.
3082 * This permits qdisc->running owner to get the lock more
3083 * often and dequeue packets faster.
3085 contended = qdisc_is_running(q);
3086 if (unlikely(contended))
3087 spin_lock(&q->busylock);
3089 spin_lock(root_lock);
3090 if (unlikely(test_bit(__QDISC_STATE_DEACTIVATED, &q->state))) {
3091 __qdisc_drop(skb, &to_free);
3093 } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
3094 qdisc_run_begin(q)) {
3096 * This is a work-conserving queue; there are no old skbs
3097 * waiting to be sent out; and the qdisc is not running -
3098 * xmit the skb directly.
3101 qdisc_bstats_update(q, skb);
3103 if (sch_direct_xmit(skb, q, dev, txq, root_lock, true)) {
3104 if (unlikely(contended)) {
3105 spin_unlock(&q->busylock);
3112 rc = NET_XMIT_SUCCESS;
3114 rc = q->enqueue(skb, q, &to_free) & NET_XMIT_MASK;
3115 if (qdisc_run_begin(q)) {
3116 if (unlikely(contended)) {
3117 spin_unlock(&q->busylock);
3123 spin_unlock(root_lock);
3124 if (unlikely(to_free))
3125 kfree_skb_list(to_free);
3126 if (unlikely(contended))
3127 spin_unlock(&q->busylock);
3131 #if IS_ENABLED(CONFIG_CGROUP_NET_PRIO)
3132 static void skb_update_prio(struct sk_buff *skb)
3134 struct netprio_map *map = rcu_dereference_bh(skb->dev->priomap);
3136 if (!skb->priority && skb->sk && map) {
3137 unsigned int prioidx =
3138 sock_cgroup_prioidx(&skb->sk->sk_cgrp_data);
3140 if (prioidx < map->priomap_len)
3141 skb->priority = map->priomap[prioidx];
3145 #define skb_update_prio(skb)
3148 DEFINE_PER_CPU(int, xmit_recursion);
3149 EXPORT_SYMBOL(xmit_recursion);
3152 * dev_loopback_xmit - loop back @skb
3153 * @net: network namespace this loopback is happening in
3154 * @sk: sk needed to be a netfilter okfn
3155 * @skb: buffer to transmit
3157 int dev_loopback_xmit(struct net *net, struct sock *sk, struct sk_buff *skb)
3159 skb_reset_mac_header(skb);
3160 __skb_pull(skb, skb_network_offset(skb));
3161 skb->pkt_type = PACKET_LOOPBACK;
3162 skb->ip_summed = CHECKSUM_UNNECESSARY;
3163 WARN_ON(!skb_dst(skb));
3168 EXPORT_SYMBOL(dev_loopback_xmit);
3170 #ifdef CONFIG_NET_EGRESS
3171 static struct sk_buff *
3172 sch_handle_egress(struct sk_buff *skb, int *ret, struct net_device *dev)
3174 struct tcf_proto *cl = rcu_dereference_bh(dev->egress_cl_list);
3175 struct tcf_result cl_res;
3180 /* skb->tc_verd and qdisc_skb_cb(skb)->pkt_len were already set
3181 * earlier by the caller.
3183 qdisc_bstats_cpu_update(cl->q, skb);
3185 switch (tc_classify(skb, cl, &cl_res, false)) {
3187 case TC_ACT_RECLASSIFY:
3188 skb->tc_index = TC_H_MIN(cl_res.classid);
3191 qdisc_qstats_cpu_drop(cl->q);
3192 *ret = NET_XMIT_DROP;
3197 *ret = NET_XMIT_SUCCESS;
3200 case TC_ACT_REDIRECT:
3201 /* No need to push/pop skb's mac_header here on egress! */
3202 skb_do_redirect(skb);
3203 *ret = NET_XMIT_SUCCESS;
3211 #endif /* CONFIG_NET_EGRESS */
3213 static inline int get_xps_queue(struct net_device *dev, struct sk_buff *skb)
3216 struct xps_dev_maps *dev_maps;
3217 struct xps_map *map;
3218 int queue_index = -1;
3221 dev_maps = rcu_dereference(dev->xps_maps);
3223 map = rcu_dereference(
3224 dev_maps->cpu_map[skb->sender_cpu - 1]);
3227 queue_index = map->queues[0];
3229 queue_index = map->queues[reciprocal_scale(skb_get_hash(skb),
3231 if (unlikely(queue_index >= dev->real_num_tx_queues))
3243 static u16 __netdev_pick_tx(struct net_device *dev, struct sk_buff *skb)
3245 struct sock *sk = skb->sk;
3246 int queue_index = sk_tx_queue_get(sk);
3248 if (queue_index < 0 || skb->ooo_okay ||
3249 queue_index >= dev->real_num_tx_queues) {
3250 int new_index = get_xps_queue(dev, skb);
3252 new_index = skb_tx_hash(dev, skb);
3254 if (queue_index != new_index && sk &&
3256 rcu_access_pointer(sk->sk_dst_cache))
3257 sk_tx_queue_set(sk, new_index);
3259 queue_index = new_index;
3265 struct netdev_queue *netdev_pick_tx(struct net_device *dev,
3266 struct sk_buff *skb,
3269 int queue_index = 0;
3272 u32 sender_cpu = skb->sender_cpu - 1;
3274 if (sender_cpu >= (u32)NR_CPUS)
3275 skb->sender_cpu = raw_smp_processor_id() + 1;
3278 if (dev->real_num_tx_queues != 1) {
3279 const struct net_device_ops *ops = dev->netdev_ops;
3280 if (ops->ndo_select_queue)
3281 queue_index = ops->ndo_select_queue(dev, skb, accel_priv,
3284 queue_index = __netdev_pick_tx(dev, skb);
3287 queue_index = netdev_cap_txqueue(dev, queue_index);
3290 skb_set_queue_mapping(skb, queue_index);
3291 return netdev_get_tx_queue(dev, queue_index);
3295 * __dev_queue_xmit - transmit a buffer
3296 * @skb: buffer to transmit
3297 * @accel_priv: private data used for L2 forwarding offload
3299 * Queue a buffer for transmission to a network device. The caller must
3300 * have set the device and priority and built the buffer before calling
3301 * this function. The function can be called from an interrupt.
3303 * A negative errno code is returned on a failure. A success does not
3304 * guarantee the frame will be transmitted as it may be dropped due
3305 * to congestion or traffic shaping.
3307 * -----------------------------------------------------------------------------------
3308 * I notice this method can also return errors from the queue disciplines,
3309 * including NET_XMIT_DROP, which is a positive value. So, errors can also
3312 * Regardless of the return value, the skb is consumed, so it is currently
3313 * difficult to retry a send to this method. (You can bump the ref count
3314 * before sending to hold a reference for retry if you are careful.)
3316 * When calling this method, interrupts MUST be enabled. This is because
3317 * the BH enable code must have IRQs enabled so that it will not deadlock.
3320 static int __dev_queue_xmit(struct sk_buff *skb, void *accel_priv)
3322 struct net_device *dev = skb->dev;
3323 struct netdev_queue *txq;
3327 skb_reset_mac_header(skb);
3329 if (unlikely(skb_shinfo(skb)->tx_flags & SKBTX_SCHED_TSTAMP))
3330 __skb_tstamp_tx(skb, NULL, skb->sk, SCM_TSTAMP_SCHED);
3332 /* Disable soft irqs for various locks below. Also
3333 * stops preemption for RCU.
3337 skb_update_prio(skb);
3339 qdisc_pkt_len_init(skb);
3340 #ifdef CONFIG_NET_CLS_ACT
3341 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_EGRESS);
3342 # ifdef CONFIG_NET_EGRESS
3343 if (static_key_false(&egress_needed)) {
3344 skb = sch_handle_egress(skb, &rc, dev);
3350 /* If device/qdisc don't need skb->dst, release it right now while
3351 * its hot in this cpu cache.
3353 if (dev->priv_flags & IFF_XMIT_DST_RELEASE)
3358 txq = netdev_pick_tx(dev, skb, accel_priv);
3359 q = rcu_dereference_bh(txq->qdisc);
3361 trace_net_dev_queue(skb);
3363 rc = __dev_xmit_skb(skb, q, dev, txq);
3367 /* The device has no queue. Common case for software devices:
3368 loopback, all the sorts of tunnels...
3370 Really, it is unlikely that netif_tx_lock protection is necessary
3371 here. (f.e. loopback and IP tunnels are clean ignoring statistics
3373 However, it is possible, that they rely on protection
3376 Check this and shot the lock. It is not prone from deadlocks.
3377 Either shot noqueue qdisc, it is even simpler 8)
3379 if (dev->flags & IFF_UP) {
3380 int cpu = smp_processor_id(); /* ok because BHs are off */
3382 if (txq->xmit_lock_owner != cpu) {
3383 if (unlikely(__this_cpu_read(xmit_recursion) >
3384 XMIT_RECURSION_LIMIT))
3385 goto recursion_alert;
3387 skb = validate_xmit_skb(skb, dev);
3391 HARD_TX_LOCK(dev, txq, cpu);
3393 if (!netif_xmit_stopped(txq)) {
3394 __this_cpu_inc(xmit_recursion);
3395 skb = dev_hard_start_xmit(skb, dev, txq, &rc);
3396 __this_cpu_dec(xmit_recursion);
3397 if (dev_xmit_complete(rc)) {
3398 HARD_TX_UNLOCK(dev, txq);
3402 HARD_TX_UNLOCK(dev, txq);
3403 net_crit_ratelimited("Virtual device %s asks to queue packet!\n",
3406 /* Recursion is detected! It is possible,
3410 net_crit_ratelimited("Dead loop on virtual device %s, fix it urgently!\n",
3416 rcu_read_unlock_bh();
3418 atomic_long_inc(&dev->tx_dropped);
3419 kfree_skb_list(skb);
3422 rcu_read_unlock_bh();
3426 int dev_queue_xmit(struct sk_buff *skb)
3428 return __dev_queue_xmit(skb, NULL);
3430 EXPORT_SYMBOL(dev_queue_xmit);
3432 int dev_queue_xmit_accel(struct sk_buff *skb, void *accel_priv)
3434 return __dev_queue_xmit(skb, accel_priv);
3436 EXPORT_SYMBOL(dev_queue_xmit_accel);
3439 /*=======================================================================
3441 =======================================================================*/
3443 int netdev_max_backlog __read_mostly = 1000;
3444 EXPORT_SYMBOL(netdev_max_backlog);
3446 int netdev_tstamp_prequeue __read_mostly = 1;
3447 int netdev_budget __read_mostly = 300;
3448 int weight_p __read_mostly = 64; /* old backlog weight */
3450 /* Called with irq disabled */
3451 static inline void ____napi_schedule(struct softnet_data *sd,
3452 struct napi_struct *napi)
3454 list_add_tail(&napi->poll_list, &sd->poll_list);
3455 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3460 /* One global table that all flow-based protocols share. */
3461 struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
3462 EXPORT_SYMBOL(rps_sock_flow_table);
3463 u32 rps_cpu_mask __read_mostly;
3464 EXPORT_SYMBOL(rps_cpu_mask);
3466 struct static_key rps_needed __read_mostly;
3467 EXPORT_SYMBOL(rps_needed);
3469 static struct rps_dev_flow *
3470 set_rps_cpu(struct net_device *dev, struct sk_buff *skb,
3471 struct rps_dev_flow *rflow, u16 next_cpu)
3473 if (next_cpu < nr_cpu_ids) {
3474 #ifdef CONFIG_RFS_ACCEL
3475 struct netdev_rx_queue *rxqueue;
3476 struct rps_dev_flow_table *flow_table;
3477 struct rps_dev_flow *old_rflow;
3482 /* Should we steer this flow to a different hardware queue? */
3483 if (!skb_rx_queue_recorded(skb) || !dev->rx_cpu_rmap ||
3484 !(dev->features & NETIF_F_NTUPLE))
3486 rxq_index = cpu_rmap_lookup_index(dev->rx_cpu_rmap, next_cpu);
3487 if (rxq_index == skb_get_rx_queue(skb))
3490 rxqueue = dev->_rx + rxq_index;
3491 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3494 flow_id = skb_get_hash(skb) & flow_table->mask;
3495 rc = dev->netdev_ops->ndo_rx_flow_steer(dev, skb,
3496 rxq_index, flow_id);
3500 rflow = &flow_table->flows[flow_id];
3502 if (old_rflow->filter == rflow->filter)
3503 old_rflow->filter = RPS_NO_FILTER;
3507 per_cpu(softnet_data, next_cpu).input_queue_head;
3510 rflow->cpu = next_cpu;
3515 * get_rps_cpu is called from netif_receive_skb and returns the target
3516 * CPU from the RPS map of the receiving queue for a given skb.
3517 * rcu_read_lock must be held on entry.
3519 static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
3520 struct rps_dev_flow **rflowp)
3522 const struct rps_sock_flow_table *sock_flow_table;
3523 struct netdev_rx_queue *rxqueue = dev->_rx;
3524 struct rps_dev_flow_table *flow_table;
3525 struct rps_map *map;
3530 if (skb_rx_queue_recorded(skb)) {
3531 u16 index = skb_get_rx_queue(skb);
3533 if (unlikely(index >= dev->real_num_rx_queues)) {
3534 WARN_ONCE(dev->real_num_rx_queues > 1,
3535 "%s received packet on queue %u, but number "
3536 "of RX queues is %u\n",
3537 dev->name, index, dev->real_num_rx_queues);
3543 /* Avoid computing hash if RFS/RPS is not active for this rxqueue */
3545 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3546 map = rcu_dereference(rxqueue->rps_map);
3547 if (!flow_table && !map)
3550 skb_reset_network_header(skb);
3551 hash = skb_get_hash(skb);
3555 sock_flow_table = rcu_dereference(rps_sock_flow_table);
3556 if (flow_table && sock_flow_table) {
3557 struct rps_dev_flow *rflow;
3561 /* First check into global flow table if there is a match */
3562 ident = sock_flow_table->ents[hash & sock_flow_table->mask];
3563 if ((ident ^ hash) & ~rps_cpu_mask)
3566 next_cpu = ident & rps_cpu_mask;
3568 /* OK, now we know there is a match,
3569 * we can look at the local (per receive queue) flow table
3571 rflow = &flow_table->flows[hash & flow_table->mask];
3575 * If the desired CPU (where last recvmsg was done) is
3576 * different from current CPU (one in the rx-queue flow
3577 * table entry), switch if one of the following holds:
3578 * - Current CPU is unset (>= nr_cpu_ids).
3579 * - Current CPU is offline.
3580 * - The current CPU's queue tail has advanced beyond the
3581 * last packet that was enqueued using this table entry.
3582 * This guarantees that all previous packets for the flow
3583 * have been dequeued, thus preserving in order delivery.
3585 if (unlikely(tcpu != next_cpu) &&
3586 (tcpu >= nr_cpu_ids || !cpu_online(tcpu) ||
3587 ((int)(per_cpu(softnet_data, tcpu).input_queue_head -
3588 rflow->last_qtail)) >= 0)) {
3590 rflow = set_rps_cpu(dev, skb, rflow, next_cpu);
3593 if (tcpu < nr_cpu_ids && cpu_online(tcpu)) {
3603 tcpu = map->cpus[reciprocal_scale(hash, map->len)];
3604 if (cpu_online(tcpu)) {
3614 #ifdef CONFIG_RFS_ACCEL
3617 * rps_may_expire_flow - check whether an RFS hardware filter may be removed
3618 * @dev: Device on which the filter was set
3619 * @rxq_index: RX queue index
3620 * @flow_id: Flow ID passed to ndo_rx_flow_steer()
3621 * @filter_id: Filter ID returned by ndo_rx_flow_steer()
3623 * Drivers that implement ndo_rx_flow_steer() should periodically call
3624 * this function for each installed filter and remove the filters for
3625 * which it returns %true.
3627 bool rps_may_expire_flow(struct net_device *dev, u16 rxq_index,
3628 u32 flow_id, u16 filter_id)
3630 struct netdev_rx_queue *rxqueue = dev->_rx + rxq_index;
3631 struct rps_dev_flow_table *flow_table;
3632 struct rps_dev_flow *rflow;
3637 flow_table = rcu_dereference(rxqueue->rps_flow_table);
3638 if (flow_table && flow_id <= flow_table->mask) {
3639 rflow = &flow_table->flows[flow_id];
3640 cpu = ACCESS_ONCE(rflow->cpu);
3641 if (rflow->filter == filter_id && cpu < nr_cpu_ids &&
3642 ((int)(per_cpu(softnet_data, cpu).input_queue_head -
3643 rflow->last_qtail) <
3644 (int)(10 * flow_table->mask)))
3650 EXPORT_SYMBOL(rps_may_expire_flow);
3652 #endif /* CONFIG_RFS_ACCEL */
3654 /* Called from hardirq (IPI) context */
3655 static void rps_trigger_softirq(void *data)
3657 struct softnet_data *sd = data;
3659 ____napi_schedule(sd, &sd->backlog);
3663 #endif /* CONFIG_RPS */
3666 * Check if this softnet_data structure is another cpu one
3667 * If yes, queue it to our IPI list and return 1
3670 static int rps_ipi_queued(struct softnet_data *sd)
3673 struct softnet_data *mysd = this_cpu_ptr(&softnet_data);
3676 sd->rps_ipi_next = mysd->rps_ipi_list;
3677 mysd->rps_ipi_list = sd;
3679 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
3682 #endif /* CONFIG_RPS */
3686 #ifdef CONFIG_NET_FLOW_LIMIT
3687 int netdev_flow_limit_table_len __read_mostly = (1 << 12);
3690 static bool skb_flow_limit(struct sk_buff *skb, unsigned int qlen)
3692 #ifdef CONFIG_NET_FLOW_LIMIT
3693 struct sd_flow_limit *fl;
3694 struct softnet_data *sd;
3695 unsigned int old_flow, new_flow;
3697 if (qlen < (netdev_max_backlog >> 1))
3700 sd = this_cpu_ptr(&softnet_data);
3703 fl = rcu_dereference(sd->flow_limit);
3705 new_flow = skb_get_hash(skb) & (fl->num_buckets - 1);
3706 old_flow = fl->history[fl->history_head];
3707 fl->history[fl->history_head] = new_flow;
3710 fl->history_head &= FLOW_LIMIT_HISTORY - 1;
3712 if (likely(fl->buckets[old_flow]))
3713 fl->buckets[old_flow]--;
3715 if (++fl->buckets[new_flow] > (FLOW_LIMIT_HISTORY >> 1)) {
3727 * enqueue_to_backlog is called to queue an skb to a per CPU backlog
3728 * queue (may be a remote CPU queue).
3730 static int enqueue_to_backlog(struct sk_buff *skb, int cpu,
3731 unsigned int *qtail)
3733 struct softnet_data *sd;
3734 unsigned long flags;
3737 sd = &per_cpu(softnet_data, cpu);
3739 local_irq_save(flags);
3742 if (!netif_running(skb->dev))
3744 qlen = skb_queue_len(&sd->input_pkt_queue);
3745 if (qlen <= netdev_max_backlog && !skb_flow_limit(skb, qlen)) {
3748 __skb_queue_tail(&sd->input_pkt_queue, skb);
3749 input_queue_tail_incr_save(sd, qtail);
3751 local_irq_restore(flags);
3752 return NET_RX_SUCCESS;
3755 /* Schedule NAPI for backlog device
3756 * We can use non atomic operation since we own the queue lock
3758 if (!__test_and_set_bit(NAPI_STATE_SCHED, &sd->backlog.state)) {
3759 if (!rps_ipi_queued(sd))
3760 ____napi_schedule(sd, &sd->backlog);
3769 local_irq_restore(flags);
3771 atomic_long_inc(&skb->dev->rx_dropped);
3776 static int netif_rx_internal(struct sk_buff *skb)
3780 net_timestamp_check(netdev_tstamp_prequeue, skb);
3782 trace_netif_rx(skb);
3784 if (static_key_false(&rps_needed)) {
3785 struct rps_dev_flow voidflow, *rflow = &voidflow;
3791 cpu = get_rps_cpu(skb->dev, skb, &rflow);
3793 cpu = smp_processor_id();
3795 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
3803 ret = enqueue_to_backlog(skb, get_cpu(), &qtail);
3810 * netif_rx - post buffer to the network code
3811 * @skb: buffer to post
3813 * This function receives a packet from a device driver and queues it for
3814 * the upper (protocol) levels to process. It always succeeds. The buffer
3815 * may be dropped during processing for congestion control or by the
3819 * NET_RX_SUCCESS (no congestion)
3820 * NET_RX_DROP (packet was dropped)
3824 int netif_rx(struct sk_buff *skb)
3826 trace_netif_rx_entry(skb);
3828 return netif_rx_internal(skb);
3830 EXPORT_SYMBOL(netif_rx);
3832 int netif_rx_ni(struct sk_buff *skb)
3836 trace_netif_rx_ni_entry(skb);
3839 err = netif_rx_internal(skb);
3840 if (local_softirq_pending())
3846 EXPORT_SYMBOL(netif_rx_ni);
3848 static void net_tx_action(struct softirq_action *h)
3850 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
3852 if (sd->completion_queue) {
3853 struct sk_buff *clist;
3855 local_irq_disable();
3856 clist = sd->completion_queue;
3857 sd->completion_queue = NULL;
3861 struct sk_buff *skb = clist;
3862 clist = clist->next;
3864 WARN_ON(atomic_read(&skb->users));
3865 if (likely(get_kfree_skb_cb(skb)->reason == SKB_REASON_CONSUMED))
3866 trace_consume_skb(skb);
3868 trace_kfree_skb(skb, net_tx_action);
3870 if (skb->fclone != SKB_FCLONE_UNAVAILABLE)
3873 __kfree_skb_defer(skb);
3876 __kfree_skb_flush();
3879 if (sd->output_queue) {
3882 local_irq_disable();
3883 head = sd->output_queue;
3884 sd->output_queue = NULL;
3885 sd->output_queue_tailp = &sd->output_queue;
3889 struct Qdisc *q = head;
3890 spinlock_t *root_lock;
3892 head = head->next_sched;
3894 root_lock = qdisc_lock(q);
3895 spin_lock(root_lock);
3896 /* We need to make sure head->next_sched is read
3897 * before clearing __QDISC_STATE_SCHED
3899 smp_mb__before_atomic();
3900 clear_bit(__QDISC_STATE_SCHED, &q->state);
3902 spin_unlock(root_lock);
3907 #if (defined(CONFIG_BRIDGE) || defined(CONFIG_BRIDGE_MODULE)) && \
3908 (defined(CONFIG_ATM_LANE) || defined(CONFIG_ATM_LANE_MODULE))
3909 /* This hook is defined here for ATM LANE */
3910 int (*br_fdb_test_addr_hook)(struct net_device *dev,
3911 unsigned char *addr) __read_mostly;
3912 EXPORT_SYMBOL_GPL(br_fdb_test_addr_hook);
3915 static inline struct sk_buff *
3916 sch_handle_ingress(struct sk_buff *skb, struct packet_type **pt_prev, int *ret,
3917 struct net_device *orig_dev)
3919 #ifdef CONFIG_NET_CLS_ACT
3920 struct tcf_proto *cl = rcu_dereference_bh(skb->dev->ingress_cl_list);
3921 struct tcf_result cl_res;
3923 /* If there's at least one ingress present somewhere (so
3924 * we get here via enabled static key), remaining devices
3925 * that are not configured with an ingress qdisc will bail
3931 *ret = deliver_skb(skb, *pt_prev, orig_dev);
3935 qdisc_skb_cb(skb)->pkt_len = skb->len;
3936 skb->tc_verd = SET_TC_AT(skb->tc_verd, AT_INGRESS);
3937 qdisc_bstats_cpu_update(cl->q, skb);
3939 switch (tc_classify(skb, cl, &cl_res, false)) {
3941 case TC_ACT_RECLASSIFY:
3942 skb->tc_index = TC_H_MIN(cl_res.classid);
3945 qdisc_qstats_cpu_drop(cl->q);
3952 case TC_ACT_REDIRECT:
3953 /* skb_mac_header check was done by cls/act_bpf, so
3954 * we can safely push the L2 header back before
3955 * redirecting to another netdev
3957 __skb_push(skb, skb->mac_len);
3958 skb_do_redirect(skb);
3963 #endif /* CONFIG_NET_CLS_ACT */
3968 * netdev_rx_handler_register - register receive handler
3969 * @dev: device to register a handler for
3970 * @rx_handler: receive handler to register
3971 * @rx_handler_data: data pointer that is used by rx handler
3973 * Register a receive handler for a device. This handler will then be
3974 * called from __netif_receive_skb. A negative errno code is returned
3977 * The caller must hold the rtnl_mutex.
3979 * For a general description of rx_handler, see enum rx_handler_result.
3981 int netdev_rx_handler_register(struct net_device *dev,
3982 rx_handler_func_t *rx_handler,
3983 void *rx_handler_data)
3987 if (dev->rx_handler)
3990 /* Note: rx_handler_data must be set before rx_handler */
3991 rcu_assign_pointer(dev->rx_handler_data, rx_handler_data);
3992 rcu_assign_pointer(dev->rx_handler, rx_handler);
3996 EXPORT_SYMBOL_GPL(netdev_rx_handler_register);
3999 * netdev_rx_handler_unregister - unregister receive handler
4000 * @dev: device to unregister a handler from
4002 * Unregister a receive handler from a device.
4004 * The caller must hold the rtnl_mutex.
4006 void netdev_rx_handler_unregister(struct net_device *dev)
4010 RCU_INIT_POINTER(dev->rx_handler, NULL);
4011 /* a reader seeing a non NULL rx_handler in a rcu_read_lock()
4012 * section has a guarantee to see a non NULL rx_handler_data
4016 RCU_INIT_POINTER(dev->rx_handler_data, NULL);
4018 EXPORT_SYMBOL_GPL(netdev_rx_handler_unregister);
4021 * Limit the use of PFMEMALLOC reserves to those protocols that implement
4022 * the special handling of PFMEMALLOC skbs.
4024 static bool skb_pfmemalloc_protocol(struct sk_buff *skb)
4026 switch (skb->protocol) {
4027 case htons(ETH_P_ARP):
4028 case htons(ETH_P_IP):
4029 case htons(ETH_P_IPV6):
4030 case htons(ETH_P_8021Q):
4031 case htons(ETH_P_8021AD):
4038 static inline int nf_ingress(struct sk_buff *skb, struct packet_type **pt_prev,
4039 int *ret, struct net_device *orig_dev)
4041 #ifdef CONFIG_NETFILTER_INGRESS
4042 if (nf_hook_ingress_active(skb)) {
4044 *ret = deliver_skb(skb, *pt_prev, orig_dev);
4048 return nf_hook_ingress(skb);
4050 #endif /* CONFIG_NETFILTER_INGRESS */
4054 static int __netif_receive_skb_core(struct sk_buff *skb, bool pfmemalloc)
4056 struct packet_type *ptype, *pt_prev;
4057 rx_handler_func_t *rx_handler;
4058 struct net_device *orig_dev;
4059 bool deliver_exact = false;
4060 int ret = NET_RX_DROP;
4063 net_timestamp_check(!netdev_tstamp_prequeue, skb);
4065 trace_netif_receive_skb(skb);
4067 orig_dev = skb->dev;
4069 skb_reset_network_header(skb);
4070 if (!skb_transport_header_was_set(skb))
4071 skb_reset_transport_header(skb);
4072 skb_reset_mac_len(skb);
4077 skb->skb_iif = skb->dev->ifindex;
4079 __this_cpu_inc(softnet_data.processed);
4081 if (skb->protocol == cpu_to_be16(ETH_P_8021Q) ||
4082 skb->protocol == cpu_to_be16(ETH_P_8021AD)) {
4083 skb = skb_vlan_untag(skb);
4088 #ifdef CONFIG_NET_CLS_ACT
4089 if (skb->tc_verd & TC_NCLS) {
4090 skb->tc_verd = CLR_TC_NCLS(skb->tc_verd);
4098 list_for_each_entry_rcu(ptype, &ptype_all, list) {
4100 ret = deliver_skb(skb, pt_prev, orig_dev);
4104 list_for_each_entry_rcu(ptype, &skb->dev->ptype_all, list) {
4106 ret = deliver_skb(skb, pt_prev, orig_dev);
4111 #ifdef CONFIG_NET_INGRESS
4112 if (static_key_false(&ingress_needed)) {
4113 skb = sch_handle_ingress(skb, &pt_prev, &ret, orig_dev);
4117 if (nf_ingress(skb, &pt_prev, &ret, orig_dev) < 0)
4121 #ifdef CONFIG_NET_CLS_ACT
4125 if (pfmemalloc && !skb_pfmemalloc_protocol(skb))
4128 if (skb_vlan_tag_present(skb)) {
4130 ret = deliver_skb(skb, pt_prev, orig_dev);
4133 if (vlan_do_receive(&skb))
4135 else if (unlikely(!skb))
4139 rx_handler = rcu_dereference(skb->dev->rx_handler);
4142 ret = deliver_skb(skb, pt_prev, orig_dev);
4145 switch (rx_handler(&skb)) {
4146 case RX_HANDLER_CONSUMED:
4147 ret = NET_RX_SUCCESS;
4149 case RX_HANDLER_ANOTHER:
4151 case RX_HANDLER_EXACT:
4152 deliver_exact = true;
4153 case RX_HANDLER_PASS:
4160 if (unlikely(skb_vlan_tag_present(skb))) {
4161 if (skb_vlan_tag_get_id(skb))
4162 skb->pkt_type = PACKET_OTHERHOST;
4163 /* Note: we might in the future use prio bits
4164 * and set skb->priority like in vlan_do_receive()
4165 * For the time being, just ignore Priority Code Point
4170 type = skb->protocol;
4172 /* deliver only exact match when indicated */
4173 if (likely(!deliver_exact)) {
4174 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
4175 &ptype_base[ntohs(type) &
4179 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
4180 &orig_dev->ptype_specific);
4182 if (unlikely(skb->dev != orig_dev)) {
4183 deliver_ptype_list_skb(skb, &pt_prev, orig_dev, type,
4184 &skb->dev->ptype_specific);
4188 if (unlikely(skb_orphan_frags(skb, GFP_ATOMIC)))
4191 ret = pt_prev->func(skb, skb->dev, pt_prev, orig_dev);
4195 atomic_long_inc(&skb->dev->rx_dropped);
4197 atomic_long_inc(&skb->dev->rx_nohandler);
4199 /* Jamal, now you will not able to escape explaining
4200 * me how you were going to use this. :-)
4209 static int __netif_receive_skb(struct sk_buff *skb)
4213 if (sk_memalloc_socks() && skb_pfmemalloc(skb)) {
4214 unsigned long pflags = current->flags;
4217 * PFMEMALLOC skbs are special, they should
4218 * - be delivered to SOCK_MEMALLOC sockets only
4219 * - stay away from userspace
4220 * - have bounded memory usage
4222 * Use PF_MEMALLOC as this saves us from propagating the allocation
4223 * context down to all allocation sites.
4225 current->flags |= PF_MEMALLOC;
4226 ret = __netif_receive_skb_core(skb, true);
4227 tsk_restore_flags(current, pflags, PF_MEMALLOC);
4229 ret = __netif_receive_skb_core(skb, false);
4234 static int netif_receive_skb_internal(struct sk_buff *skb)
4238 net_timestamp_check(netdev_tstamp_prequeue, skb);
4240 if (skb_defer_rx_timestamp(skb))
4241 return NET_RX_SUCCESS;
4246 if (static_key_false(&rps_needed)) {
4247 struct rps_dev_flow voidflow, *rflow = &voidflow;
4248 int cpu = get_rps_cpu(skb->dev, skb, &rflow);
4251 ret = enqueue_to_backlog(skb, cpu, &rflow->last_qtail);
4257 ret = __netif_receive_skb(skb);
4263 * netif_receive_skb - process receive buffer from network
4264 * @skb: buffer to process
4266 * netif_receive_skb() is the main receive data processing function.
4267 * It always succeeds. The buffer may be dropped during processing
4268 * for congestion control or by the protocol layers.
4270 * This function may only be called from softirq context and interrupts
4271 * should be enabled.
4273 * Return values (usually ignored):
4274 * NET_RX_SUCCESS: no congestion
4275 * NET_RX_DROP: packet was dropped
4277 int netif_receive_skb(struct sk_buff *skb)
4279 trace_netif_receive_skb_entry(skb);
4281 return netif_receive_skb_internal(skb);
4283 EXPORT_SYMBOL(netif_receive_skb);
4286 struct net_device *dev;
4287 struct work_struct work;
4290 DEFINE_PER_CPU(struct flush_work, flush_works);
4292 /* Network device is going away, flush any packets still pending */
4293 static void flush_backlog(struct work_struct *work)
4295 struct flush_work *flush = container_of(work, typeof(*flush), work);
4296 struct net_device *dev = flush->dev;
4297 struct sk_buff *skb, *tmp;
4298 struct softnet_data *sd;
4301 sd = this_cpu_ptr(&softnet_data);
4303 local_irq_disable();
4305 skb_queue_walk_safe(&sd->input_pkt_queue, skb, tmp) {
4306 if (skb->dev == dev) {
4307 __skb_unlink(skb, &sd->input_pkt_queue);
4309 input_queue_head_incr(sd);
4315 skb_queue_walk_safe(&sd->process_queue, skb, tmp) {
4316 if (skb->dev == dev) {
4317 __skb_unlink(skb, &sd->process_queue);
4319 input_queue_head_incr(sd);
4325 static void flush_all_backlogs(struct net_device *dev)
4331 for_each_online_cpu(cpu) {
4332 struct flush_work *flush = per_cpu_ptr(&flush_works, cpu);
4334 INIT_WORK(&flush->work, flush_backlog);
4336 queue_work_on(cpu, system_highpri_wq, &flush->work);
4339 for_each_online_cpu(cpu)
4340 flush_work(&per_cpu_ptr(&flush_works, cpu)->work);
4345 static int napi_gro_complete(struct sk_buff *skb)
4347 struct packet_offload *ptype;
4348 __be16 type = skb->protocol;
4349 struct list_head *head = &offload_base;
4352 BUILD_BUG_ON(sizeof(struct napi_gro_cb) > sizeof(skb->cb));
4354 if (NAPI_GRO_CB(skb)->count == 1) {
4355 skb_shinfo(skb)->gso_size = 0;
4360 list_for_each_entry_rcu(ptype, head, list) {
4361 if (ptype->type != type || !ptype->callbacks.gro_complete)
4364 err = ptype->callbacks.gro_complete(skb, 0);
4370 WARN_ON(&ptype->list == head);
4372 return NET_RX_SUCCESS;
4376 return netif_receive_skb_internal(skb);
4379 /* napi->gro_list contains packets ordered by age.
4380 * youngest packets at the head of it.
4381 * Complete skbs in reverse order to reduce latencies.
4383 void napi_gro_flush(struct napi_struct *napi, bool flush_old)
4385 struct sk_buff *skb, *prev = NULL;
4387 /* scan list and build reverse chain */
4388 for (skb = napi->gro_list; skb != NULL; skb = skb->next) {
4393 for (skb = prev; skb; skb = prev) {
4396 if (flush_old && NAPI_GRO_CB(skb)->age == jiffies)
4400 napi_gro_complete(skb);
4404 napi->gro_list = NULL;
4406 EXPORT_SYMBOL(napi_gro_flush);
4408 static void gro_list_prepare(struct napi_struct *napi, struct sk_buff *skb)
4411 unsigned int maclen = skb->dev->hard_header_len;
4412 u32 hash = skb_get_hash_raw(skb);
4414 for (p = napi->gro_list; p; p = p->next) {
4415 unsigned long diffs;
4417 NAPI_GRO_CB(p)->flush = 0;
4419 if (hash != skb_get_hash_raw(p)) {
4420 NAPI_GRO_CB(p)->same_flow = 0;
4424 diffs = (unsigned long)p->dev ^ (unsigned long)skb->dev;
4425 diffs |= p->vlan_tci ^ skb->vlan_tci;
4426 diffs |= skb_metadata_dst_cmp(p, skb);
4427 if (maclen == ETH_HLEN)
4428 diffs |= compare_ether_header(skb_mac_header(p),
4429 skb_mac_header(skb));
4431 diffs = memcmp(skb_mac_header(p),
4432 skb_mac_header(skb),
4434 NAPI_GRO_CB(p)->same_flow = !diffs;
4438 static void skb_gro_reset_offset(struct sk_buff *skb)
4440 const struct skb_shared_info *pinfo = skb_shinfo(skb);
4441 const skb_frag_t *frag0 = &pinfo->frags[0];
4443 NAPI_GRO_CB(skb)->data_offset = 0;
4444 NAPI_GRO_CB(skb)->frag0 = NULL;
4445 NAPI_GRO_CB(skb)->frag0_len = 0;
4447 if (skb_mac_header(skb) == skb_tail_pointer(skb) &&
4449 !PageHighMem(skb_frag_page(frag0))) {
4450 NAPI_GRO_CB(skb)->frag0 = skb_frag_address(frag0);
4451 NAPI_GRO_CB(skb)->frag0_len = skb_frag_size(frag0);
4455 static void gro_pull_from_frag0(struct sk_buff *skb, int grow)
4457 struct skb_shared_info *pinfo = skb_shinfo(skb);
4459 BUG_ON(skb->end - skb->tail < grow);
4461 memcpy(skb_tail_pointer(skb), NAPI_GRO_CB(skb)->frag0, grow);
4463 skb->data_len -= grow;
4466 pinfo->frags[0].page_offset += grow;
4467 skb_frag_size_sub(&pinfo->frags[0], grow);
4469 if (unlikely(!skb_frag_size(&pinfo->frags[0]))) {
4470 skb_frag_unref(skb, 0);
4471 memmove(pinfo->frags, pinfo->frags + 1,
4472 --pinfo->nr_frags * sizeof(pinfo->frags[0]));
4476 static enum gro_result dev_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
4478 struct sk_buff **pp = NULL;
4479 struct packet_offload *ptype;
4480 __be16 type = skb->protocol;
4481 struct list_head *head = &offload_base;
4483 enum gro_result ret;
4486 if (!(skb->dev->features & NETIF_F_GRO))
4489 if (skb_is_gso(skb) || skb_has_frag_list(skb) || skb->csum_bad)
4492 gro_list_prepare(napi, skb);
4495 list_for_each_entry_rcu(ptype, head, list) {
4496 if (ptype->type != type || !ptype->callbacks.gro_receive)
4499 skb_set_network_header(skb, skb_gro_offset(skb));
4500 skb_reset_mac_len(skb);
4501 NAPI_GRO_CB(skb)->same_flow = 0;
4502 NAPI_GRO_CB(skb)->flush = 0;
4503 NAPI_GRO_CB(skb)->free = 0;
4504 NAPI_GRO_CB(skb)->encap_mark = 0;
4505 NAPI_GRO_CB(skb)->is_fou = 0;
4506 NAPI_GRO_CB(skb)->is_atomic = 1;
4507 NAPI_GRO_CB(skb)->gro_remcsum_start = 0;
4509 /* Setup for GRO checksum validation */
4510 switch (skb->ip_summed) {
4511 case CHECKSUM_COMPLETE:
4512 NAPI_GRO_CB(skb)->csum = skb->csum;
4513 NAPI_GRO_CB(skb)->csum_valid = 1;
4514 NAPI_GRO_CB(skb)->csum_cnt = 0;
4516 case CHECKSUM_UNNECESSARY:
4517 NAPI_GRO_CB(skb)->csum_cnt = skb->csum_level + 1;
4518 NAPI_GRO_CB(skb)->csum_valid = 0;
4521 NAPI_GRO_CB(skb)->csum_cnt = 0;
4522 NAPI_GRO_CB(skb)->csum_valid = 0;
4525 pp = ptype->callbacks.gro_receive(&napi->gro_list, skb);
4530 if (&ptype->list == head)
4533 same_flow = NAPI_GRO_CB(skb)->same_flow;
4534 ret = NAPI_GRO_CB(skb)->free ? GRO_MERGED_FREE : GRO_MERGED;
4537 struct sk_buff *nskb = *pp;
4541 napi_gro_complete(nskb);
4548 if (NAPI_GRO_CB(skb)->flush)
4551 if (unlikely(napi->gro_count >= MAX_GRO_SKBS)) {
4552 struct sk_buff *nskb = napi->gro_list;
4554 /* locate the end of the list to select the 'oldest' flow */
4555 while (nskb->next) {
4561 napi_gro_complete(nskb);
4565 NAPI_GRO_CB(skb)->count = 1;
4566 NAPI_GRO_CB(skb)->age = jiffies;
4567 NAPI_GRO_CB(skb)->last = skb;
4568 skb_shinfo(skb)->gso_size = skb_gro_len(skb);
4569 skb->next = napi->gro_list;
4570 napi->gro_list = skb;
4574 grow = skb_gro_offset(skb) - skb_headlen(skb);
4576 gro_pull_from_frag0(skb, grow);
4585 struct packet_offload *gro_find_receive_by_type(__be16 type)
4587 struct list_head *offload_head = &offload_base;
4588 struct packet_offload *ptype;
4590 list_for_each_entry_rcu(ptype, offload_head, list) {
4591 if (ptype->type != type || !ptype->callbacks.gro_receive)
4597 EXPORT_SYMBOL(gro_find_receive_by_type);
4599 struct packet_offload *gro_find_complete_by_type(__be16 type)
4601 struct list_head *offload_head = &offload_base;
4602 struct packet_offload *ptype;
4604 list_for_each_entry_rcu(ptype, offload_head, list) {
4605 if (ptype->type != type || !ptype->callbacks.gro_complete)
4611 EXPORT_SYMBOL(gro_find_complete_by_type);
4613 static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
4617 if (netif_receive_skb_internal(skb))
4625 case GRO_MERGED_FREE:
4626 if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) {
4628 kmem_cache_free(skbuff_head_cache, skb);
4642 gro_result_t napi_gro_receive(struct napi_struct *napi, struct sk_buff *skb)
4644 skb_mark_napi_id(skb, napi);
4645 trace_napi_gro_receive_entry(skb);
4647 skb_gro_reset_offset(skb);
4649 return napi_skb_finish(dev_gro_receive(napi, skb), skb);
4651 EXPORT_SYMBOL(napi_gro_receive);
4653 static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
4655 if (unlikely(skb->pfmemalloc)) {
4659 __skb_pull(skb, skb_headlen(skb));
4660 /* restore the reserve we had after netdev_alloc_skb_ip_align() */
4661 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN - skb_headroom(skb));
4663 skb->dev = napi->dev;
4665 skb->encapsulation = 0;
4666 skb_shinfo(skb)->gso_type = 0;
4667 skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
4672 struct sk_buff *napi_get_frags(struct napi_struct *napi)
4674 struct sk_buff *skb = napi->skb;
4677 skb = napi_alloc_skb(napi, GRO_MAX_HEAD);
4680 skb_mark_napi_id(skb, napi);
4685 EXPORT_SYMBOL(napi_get_frags);
4687 static gro_result_t napi_frags_finish(struct napi_struct *napi,
4688 struct sk_buff *skb,
4694 __skb_push(skb, ETH_HLEN);
4695 skb->protocol = eth_type_trans(skb, skb->dev);
4696 if (ret == GRO_NORMAL && netif_receive_skb_internal(skb))
4701 case GRO_MERGED_FREE:
4702 napi_reuse_skb(napi, skb);
4712 /* Upper GRO stack assumes network header starts at gro_offset=0
4713 * Drivers could call both napi_gro_frags() and napi_gro_receive()
4714 * We copy ethernet header into skb->data to have a common layout.
4716 static struct sk_buff *napi_frags_skb(struct napi_struct *napi)
4718 struct sk_buff *skb = napi->skb;
4719 const struct ethhdr *eth;
4720 unsigned int hlen = sizeof(*eth);
4724 skb_reset_mac_header(skb);
4725 skb_gro_reset_offset(skb);
4727 eth = skb_gro_header_fast(skb, 0);
4728 if (unlikely(skb_gro_header_hard(skb, hlen))) {
4729 eth = skb_gro_header_slow(skb, hlen, 0);
4730 if (unlikely(!eth)) {
4731 net_warn_ratelimited("%s: dropping impossible skb from %s\n",
4732 __func__, napi->dev->name);
4733 napi_reuse_skb(napi, skb);
4737 gro_pull_from_frag0(skb, hlen);
4738 NAPI_GRO_CB(skb)->frag0 += hlen;
4739 NAPI_GRO_CB(skb)->frag0_len -= hlen;
4741 __skb_pull(skb, hlen);
4744 * This works because the only protocols we care about don't require
4746 * We'll fix it up properly in napi_frags_finish()
4748 skb->protocol = eth->h_proto;
4753 gro_result_t napi_gro_frags(struct napi_struct *napi)
4755 struct sk_buff *skb = napi_frags_skb(napi);
4760 trace_napi_gro_frags_entry(skb);
4762 return napi_frags_finish(napi, skb, dev_gro_receive(napi, skb));
4764 EXPORT_SYMBOL(napi_gro_frags);
4766 /* Compute the checksum from gro_offset and return the folded value
4767 * after adding in any pseudo checksum.
4769 __sum16 __skb_gro_checksum_complete(struct sk_buff *skb)
4774 wsum = skb_checksum(skb, skb_gro_offset(skb), skb_gro_len(skb), 0);
4776 /* NAPI_GRO_CB(skb)->csum holds pseudo checksum */
4777 sum = csum_fold(csum_add(NAPI_GRO_CB(skb)->csum, wsum));
4779 if (unlikely(skb->ip_summed == CHECKSUM_COMPLETE) &&
4780 !skb->csum_complete_sw)
4781 netdev_rx_csum_fault(skb->dev);
4784 NAPI_GRO_CB(skb)->csum = wsum;
4785 NAPI_GRO_CB(skb)->csum_valid = 1;
4789 EXPORT_SYMBOL(__skb_gro_checksum_complete);
4792 * net_rps_action_and_irq_enable sends any pending IPI's for rps.
4793 * Note: called with local irq disabled, but exits with local irq enabled.
4795 static void net_rps_action_and_irq_enable(struct softnet_data *sd)
4798 struct softnet_data *remsd = sd->rps_ipi_list;
4801 sd->rps_ipi_list = NULL;
4805 /* Send pending IPI's to kick RPS processing on remote cpus. */
4807 struct softnet_data *next = remsd->rps_ipi_next;
4809 if (cpu_online(remsd->cpu))
4810 smp_call_function_single_async(remsd->cpu,
4819 static bool sd_has_rps_ipi_waiting(struct softnet_data *sd)
4822 return sd->rps_ipi_list != NULL;
4828 static int process_backlog(struct napi_struct *napi, int quota)
4830 struct softnet_data *sd = container_of(napi, struct softnet_data, backlog);
4834 /* Check if we have pending ipi, its better to send them now,
4835 * not waiting net_rx_action() end.
4837 if (sd_has_rps_ipi_waiting(sd)) {
4838 local_irq_disable();
4839 net_rps_action_and_irq_enable(sd);
4842 napi->weight = weight_p;
4844 struct sk_buff *skb;
4846 while ((skb = __skb_dequeue(&sd->process_queue))) {
4848 __netif_receive_skb(skb);
4850 input_queue_head_incr(sd);
4851 if (++work >= quota)
4856 local_irq_disable();
4858 if (skb_queue_empty(&sd->input_pkt_queue)) {
4860 * Inline a custom version of __napi_complete().
4861 * only current cpu owns and manipulates this napi,
4862 * and NAPI_STATE_SCHED is the only possible flag set
4864 * We can use a plain write instead of clear_bit(),
4865 * and we dont need an smp_mb() memory barrier.
4870 skb_queue_splice_tail_init(&sd->input_pkt_queue,
4871 &sd->process_queue);
4881 * __napi_schedule - schedule for receive
4882 * @n: entry to schedule
4884 * The entry's receive function will be scheduled to run.
4885 * Consider using __napi_schedule_irqoff() if hard irqs are masked.
4887 void __napi_schedule(struct napi_struct *n)
4889 unsigned long flags;
4891 local_irq_save(flags);
4892 ____napi_schedule(this_cpu_ptr(&softnet_data), n);
4893 local_irq_restore(flags);
4895 EXPORT_SYMBOL(__napi_schedule);
4898 * __napi_schedule_irqoff - schedule for receive
4899 * @n: entry to schedule
4901 * Variant of __napi_schedule() assuming hard irqs are masked
4903 void __napi_schedule_irqoff(struct napi_struct *n)
4905 ____napi_schedule(this_cpu_ptr(&softnet_data), n);
4907 EXPORT_SYMBOL(__napi_schedule_irqoff);
4909 void __napi_complete(struct napi_struct *n)
4911 BUG_ON(!test_bit(NAPI_STATE_SCHED, &n->state));
4913 list_del_init(&n->poll_list);
4914 smp_mb__before_atomic();
4915 clear_bit(NAPI_STATE_SCHED, &n->state);
4917 EXPORT_SYMBOL(__napi_complete);
4919 void napi_complete_done(struct napi_struct *n, int work_done)
4921 unsigned long flags;
4924 * don't let napi dequeue from the cpu poll list
4925 * just in case its running on a different cpu
4927 if (unlikely(test_bit(NAPI_STATE_NPSVC, &n->state)))
4931 unsigned long timeout = 0;
4934 timeout = n->dev->gro_flush_timeout;
4937 hrtimer_start(&n->timer, ns_to_ktime(timeout),
4938 HRTIMER_MODE_REL_PINNED);
4940 napi_gro_flush(n, false);
4942 if (likely(list_empty(&n->poll_list))) {
4943 WARN_ON_ONCE(!test_and_clear_bit(NAPI_STATE_SCHED, &n->state));
4945 /* If n->poll_list is not empty, we need to mask irqs */
4946 local_irq_save(flags);
4948 local_irq_restore(flags);
4951 EXPORT_SYMBOL(napi_complete_done);
4953 /* must be called under rcu_read_lock(), as we dont take a reference */
4954 static struct napi_struct *napi_by_id(unsigned int napi_id)
4956 unsigned int hash = napi_id % HASH_SIZE(napi_hash);
4957 struct napi_struct *napi;
4959 hlist_for_each_entry_rcu(napi, &napi_hash[hash], napi_hash_node)
4960 if (napi->napi_id == napi_id)
4966 #if defined(CONFIG_NET_RX_BUSY_POLL)
4967 #define BUSY_POLL_BUDGET 8
4968 bool sk_busy_loop(struct sock *sk, int nonblock)
4970 unsigned long end_time = !nonblock ? sk_busy_loop_end_time(sk) : 0;
4971 int (*busy_poll)(struct napi_struct *dev);
4972 struct napi_struct *napi;
4977 napi = napi_by_id(sk->sk_napi_id);
4981 /* Note: ndo_busy_poll method is optional in linux-4.5 */
4982 busy_poll = napi->dev->netdev_ops->ndo_busy_poll;
4988 rc = busy_poll(napi);
4989 } else if (napi_schedule_prep(napi)) {
4990 void *have = netpoll_poll_lock(napi);
4992 if (test_bit(NAPI_STATE_SCHED, &napi->state)) {
4993 rc = napi->poll(napi, BUSY_POLL_BUDGET);
4994 trace_napi_poll(napi, rc, BUSY_POLL_BUDGET);
4995 if (rc == BUSY_POLL_BUDGET) {
4996 napi_complete_done(napi, rc);
4997 napi_schedule(napi);
5000 netpoll_poll_unlock(have);
5003 __NET_ADD_STATS(sock_net(sk),
5004 LINUX_MIB_BUSYPOLLRXPACKETS, rc);
5007 if (rc == LL_FLUSH_FAILED)
5008 break; /* permanent failure */
5011 } while (!nonblock && skb_queue_empty(&sk->sk_receive_queue) &&
5012 !need_resched() && !busy_loop_timeout(end_time));
5014 rc = !skb_queue_empty(&sk->sk_receive_queue);
5019 EXPORT_SYMBOL(sk_busy_loop);
5021 #endif /* CONFIG_NET_RX_BUSY_POLL */
5023 void napi_hash_add(struct napi_struct *napi)
5025 if (test_bit(NAPI_STATE_NO_BUSY_POLL, &napi->state) ||
5026 test_and_set_bit(NAPI_STATE_HASHED, &napi->state))
5029 spin_lock(&napi_hash_lock);
5031 /* 0..NR_CPUS+1 range is reserved for sender_cpu use */
5033 if (unlikely(++napi_gen_id < NR_CPUS + 1))
5034 napi_gen_id = NR_CPUS + 1;
5035 } while (napi_by_id(napi_gen_id));
5036 napi->napi_id = napi_gen_id;
5038 hlist_add_head_rcu(&napi->napi_hash_node,
5039 &napi_hash[napi->napi_id % HASH_SIZE(napi_hash)]);
5041 spin_unlock(&napi_hash_lock);
5043 EXPORT_SYMBOL_GPL(napi_hash_add);
5045 /* Warning : caller is responsible to make sure rcu grace period
5046 * is respected before freeing memory containing @napi
5048 bool napi_hash_del(struct napi_struct *napi)
5050 bool rcu_sync_needed = false;
5052 spin_lock(&napi_hash_lock);
5054 if (test_and_clear_bit(NAPI_STATE_HASHED, &napi->state)) {
5055 rcu_sync_needed = true;
5056 hlist_del_rcu(&napi->napi_hash_node);
5058 spin_unlock(&napi_hash_lock);
5059 return rcu_sync_needed;
5061 EXPORT_SYMBOL_GPL(napi_hash_del);
5063 static enum hrtimer_restart napi_watchdog(struct hrtimer *timer)
5065 struct napi_struct *napi;
5067 napi = container_of(timer, struct napi_struct, timer);
5069 napi_schedule(napi);
5071 return HRTIMER_NORESTART;
5074 void netif_napi_add(struct net_device *dev, struct napi_struct *napi,
5075 int (*poll)(struct napi_struct *, int), int weight)
5077 INIT_LIST_HEAD(&napi->poll_list);
5078 hrtimer_init(&napi->timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL_PINNED);
5079 napi->timer.function = napi_watchdog;
5080 napi->gro_count = 0;
5081 napi->gro_list = NULL;
5084 if (weight > NAPI_POLL_WEIGHT)
5085 pr_err_once("netif_napi_add() called with weight %d on device %s\n",
5087 napi->weight = weight;
5088 list_add(&napi->dev_list, &dev->napi_list);
5090 #ifdef CONFIG_NETPOLL
5091 spin_lock_init(&napi->poll_lock);
5092 napi->poll_owner = -1;
5094 set_bit(NAPI_STATE_SCHED, &napi->state);
5095 napi_hash_add(napi);
5097 EXPORT_SYMBOL(netif_napi_add);
5099 void napi_disable(struct napi_struct *n)
5102 set_bit(NAPI_STATE_DISABLE, &n->state);
5104 while (test_and_set_bit(NAPI_STATE_SCHED, &n->state))
5106 while (test_and_set_bit(NAPI_STATE_NPSVC, &n->state))
5109 hrtimer_cancel(&n->timer);
5111 clear_bit(NAPI_STATE_DISABLE, &n->state);
5113 EXPORT_SYMBOL(napi_disable);
5115 /* Must be called in process context */
5116 void netif_napi_del(struct napi_struct *napi)
5119 if (napi_hash_del(napi))
5121 list_del_init(&napi->dev_list);
5122 napi_free_frags(napi);
5124 kfree_skb_list(napi->gro_list);
5125 napi->gro_list = NULL;
5126 napi->gro_count = 0;
5128 EXPORT_SYMBOL(netif_napi_del);
5130 static int napi_poll(struct napi_struct *n, struct list_head *repoll)
5135 list_del_init(&n->poll_list);
5137 have = netpoll_poll_lock(n);
5141 /* This NAPI_STATE_SCHED test is for avoiding a race
5142 * with netpoll's poll_napi(). Only the entity which
5143 * obtains the lock and sees NAPI_STATE_SCHED set will
5144 * actually make the ->poll() call. Therefore we avoid
5145 * accidentally calling ->poll() when NAPI is not scheduled.
5148 if (test_bit(NAPI_STATE_SCHED, &n->state)) {
5149 work = n->poll(n, weight);
5150 trace_napi_poll(n, work, weight);
5153 WARN_ON_ONCE(work > weight);
5155 if (likely(work < weight))
5158 /* Drivers must not modify the NAPI state if they
5159 * consume the entire weight. In such cases this code
5160 * still "owns" the NAPI instance and therefore can
5161 * move the instance around on the list at-will.
5163 if (unlikely(napi_disable_pending(n))) {
5169 /* flush too old packets
5170 * If HZ < 1000, flush all packets.
5172 napi_gro_flush(n, HZ >= 1000);
5175 /* Some drivers may have called napi_schedule
5176 * prior to exhausting their budget.
5178 if (unlikely(!list_empty(&n->poll_list))) {
5179 pr_warn_once("%s: Budget exhausted after napi rescheduled\n",
5180 n->dev ? n->dev->name : "backlog");
5184 list_add_tail(&n->poll_list, repoll);
5187 netpoll_poll_unlock(have);
5192 static void net_rx_action(struct softirq_action *h)
5194 struct softnet_data *sd = this_cpu_ptr(&softnet_data);
5195 unsigned long time_limit = jiffies + 2;
5196 int budget = netdev_budget;
5200 local_irq_disable();
5201 list_splice_init(&sd->poll_list, &list);
5205 struct napi_struct *n;
5207 if (list_empty(&list)) {
5208 if (!sd_has_rps_ipi_waiting(sd) && list_empty(&repoll))
5213 n = list_first_entry(&list, struct napi_struct, poll_list);
5214 budget -= napi_poll(n, &repoll);
5216 /* If softirq window is exhausted then punt.
5217 * Allow this to run for 2 jiffies since which will allow
5218 * an average latency of 1.5/HZ.
5220 if (unlikely(budget <= 0 ||
5221 time_after_eq(jiffies, time_limit))) {
5227 __kfree_skb_flush();
5228 local_irq_disable();
5230 list_splice_tail_init(&sd->poll_list, &list);
5231 list_splice_tail(&repoll, &list);
5232 list_splice(&list, &sd->poll_list);
5233 if (!list_empty(&sd->poll_list))
5234 __raise_softirq_irqoff(NET_RX_SOFTIRQ);
5236 net_rps_action_and_irq_enable(sd);
5239 struct netdev_adjacent {
5240 struct net_device *dev;
5242 /* upper master flag, there can only be one master device per list */
5245 /* counter for the number of times this device was added to us */
5248 /* private field for the users */
5251 struct list_head list;
5252 struct rcu_head rcu;
5255 static struct netdev_adjacent *__netdev_find_adj(struct net_device *adj_dev,
5256 struct list_head *adj_list)
5258 struct netdev_adjacent *adj;
5260 list_for_each_entry(adj, adj_list, list) {
5261 if (adj->dev == adj_dev)
5268 * netdev_has_upper_dev - Check if device is linked to an upper device
5270 * @upper_dev: upper device to check
5272 * Find out if a device is linked to specified upper device and return true
5273 * in case it is. Note that this checks only immediate upper device,
5274 * not through a complete stack of devices. The caller must hold the RTNL lock.
5276 bool netdev_has_upper_dev(struct net_device *dev,
5277 struct net_device *upper_dev)
5281 return __netdev_find_adj(upper_dev, &dev->all_adj_list.upper);
5283 EXPORT_SYMBOL(netdev_has_upper_dev);
5286 * netdev_has_any_upper_dev - Check if device is linked to some device
5289 * Find out if a device is linked to an upper device and return true in case
5290 * it is. The caller must hold the RTNL lock.
5292 static bool netdev_has_any_upper_dev(struct net_device *dev)
5296 return !list_empty(&dev->all_adj_list.upper);
5300 * netdev_master_upper_dev_get - Get master upper device
5303 * Find a master upper device and return pointer to it or NULL in case
5304 * it's not there. The caller must hold the RTNL lock.
5306 struct net_device *netdev_master_upper_dev_get(struct net_device *dev)
5308 struct netdev_adjacent *upper;
5312 if (list_empty(&dev->adj_list.upper))
5315 upper = list_first_entry(&dev->adj_list.upper,
5316 struct netdev_adjacent, list);
5317 if (likely(upper->master))
5321 EXPORT_SYMBOL(netdev_master_upper_dev_get);
5323 void *netdev_adjacent_get_private(struct list_head *adj_list)
5325 struct netdev_adjacent *adj;
5327 adj = list_entry(adj_list, struct netdev_adjacent, list);
5329 return adj->private;
5331 EXPORT_SYMBOL(netdev_adjacent_get_private);
5334 * netdev_upper_get_next_dev_rcu - Get the next dev from upper list
5336 * @iter: list_head ** of the current position
5338 * Gets the next device from the dev's upper list, starting from iter
5339 * position. The caller must hold RCU read lock.
5341 struct net_device *netdev_upper_get_next_dev_rcu(struct net_device *dev,
5342 struct list_head **iter)
5344 struct netdev_adjacent *upper;
5346 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
5348 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
5350 if (&upper->list == &dev->adj_list.upper)
5353 *iter = &upper->list;
5357 EXPORT_SYMBOL(netdev_upper_get_next_dev_rcu);
5360 * netdev_all_upper_get_next_dev_rcu - Get the next dev from upper list
5362 * @iter: list_head ** of the current position
5364 * Gets the next device from the dev's upper list, starting from iter
5365 * position. The caller must hold RCU read lock.
5367 struct net_device *netdev_all_upper_get_next_dev_rcu(struct net_device *dev,
5368 struct list_head **iter)
5370 struct netdev_adjacent *upper;
5372 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
5374 upper = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
5376 if (&upper->list == &dev->all_adj_list.upper)
5379 *iter = &upper->list;
5383 EXPORT_SYMBOL(netdev_all_upper_get_next_dev_rcu);
5386 * netdev_lower_get_next_private - Get the next ->private from the
5387 * lower neighbour list
5389 * @iter: list_head ** of the current position
5391 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5392 * list, starting from iter position. The caller must hold either hold the
5393 * RTNL lock or its own locking that guarantees that the neighbour lower
5394 * list will remain unchanged.
5396 void *netdev_lower_get_next_private(struct net_device *dev,
5397 struct list_head **iter)
5399 struct netdev_adjacent *lower;
5401 lower = list_entry(*iter, struct netdev_adjacent, list);
5403 if (&lower->list == &dev->adj_list.lower)
5406 *iter = lower->list.next;
5408 return lower->private;
5410 EXPORT_SYMBOL(netdev_lower_get_next_private);
5413 * netdev_lower_get_next_private_rcu - Get the next ->private from the
5414 * lower neighbour list, RCU
5417 * @iter: list_head ** of the current position
5419 * Gets the next netdev_adjacent->private from the dev's lower neighbour
5420 * list, starting from iter position. The caller must hold RCU read lock.
5422 void *netdev_lower_get_next_private_rcu(struct net_device *dev,
5423 struct list_head **iter)
5425 struct netdev_adjacent *lower;
5427 WARN_ON_ONCE(!rcu_read_lock_held());
5429 lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
5431 if (&lower->list == &dev->adj_list.lower)
5434 *iter = &lower->list;
5436 return lower->private;
5438 EXPORT_SYMBOL(netdev_lower_get_next_private_rcu);
5441 * netdev_lower_get_next - Get the next device from the lower neighbour
5444 * @iter: list_head ** of the current position
5446 * Gets the next netdev_adjacent from the dev's lower neighbour
5447 * list, starting from iter position. The caller must hold RTNL lock or
5448 * its own locking that guarantees that the neighbour lower
5449 * list will remain unchanged.
5451 void *netdev_lower_get_next(struct net_device *dev, struct list_head **iter)
5453 struct netdev_adjacent *lower;
5455 lower = list_entry(*iter, struct netdev_adjacent, list);
5457 if (&lower->list == &dev->adj_list.lower)
5460 *iter = lower->list.next;
5464 EXPORT_SYMBOL(netdev_lower_get_next);
5467 * netdev_all_lower_get_next - Get the next device from all lower neighbour list
5469 * @iter: list_head ** of the current position
5471 * Gets the next netdev_adjacent from the dev's all lower neighbour
5472 * list, starting from iter position. The caller must hold RTNL lock or
5473 * its own locking that guarantees that the neighbour all lower
5474 * list will remain unchanged.
5476 struct net_device *netdev_all_lower_get_next(struct net_device *dev, struct list_head **iter)
5478 struct netdev_adjacent *lower;
5480 lower = list_entry(*iter, struct netdev_adjacent, list);
5482 if (&lower->list == &dev->all_adj_list.lower)
5485 *iter = lower->list.next;
5489 EXPORT_SYMBOL(netdev_all_lower_get_next);
5492 * netdev_all_lower_get_next_rcu - Get the next device from all
5493 * lower neighbour list, RCU variant
5495 * @iter: list_head ** of the current position
5497 * Gets the next netdev_adjacent from the dev's all lower neighbour
5498 * list, starting from iter position. The caller must hold RCU read lock.
5500 struct net_device *netdev_all_lower_get_next_rcu(struct net_device *dev,
5501 struct list_head **iter)
5503 struct netdev_adjacent *lower;
5505 lower = list_first_or_null_rcu(&dev->all_adj_list.lower,
5506 struct netdev_adjacent, list);
5508 return lower ? lower->dev : NULL;
5510 EXPORT_SYMBOL(netdev_all_lower_get_next_rcu);
5513 * netdev_lower_get_first_private_rcu - Get the first ->private from the
5514 * lower neighbour list, RCU
5518 * Gets the first netdev_adjacent->private from the dev's lower neighbour
5519 * list. The caller must hold RCU read lock.
5521 void *netdev_lower_get_first_private_rcu(struct net_device *dev)
5523 struct netdev_adjacent *lower;
5525 lower = list_first_or_null_rcu(&dev->adj_list.lower,
5526 struct netdev_adjacent, list);
5528 return lower->private;
5531 EXPORT_SYMBOL(netdev_lower_get_first_private_rcu);
5534 * netdev_master_upper_dev_get_rcu - Get master upper device
5537 * Find a master upper device and return pointer to it or NULL in case
5538 * it's not there. The caller must hold the RCU read lock.
5540 struct net_device *netdev_master_upper_dev_get_rcu(struct net_device *dev)
5542 struct netdev_adjacent *upper;
5544 upper = list_first_or_null_rcu(&dev->adj_list.upper,
5545 struct netdev_adjacent, list);
5546 if (upper && likely(upper->master))
5550 EXPORT_SYMBOL(netdev_master_upper_dev_get_rcu);
5552 static int netdev_adjacent_sysfs_add(struct net_device *dev,
5553 struct net_device *adj_dev,
5554 struct list_head *dev_list)
5556 char linkname[IFNAMSIZ+7];
5557 sprintf(linkname, dev_list == &dev->adj_list.upper ?
5558 "upper_%s" : "lower_%s", adj_dev->name);
5559 return sysfs_create_link(&(dev->dev.kobj), &(adj_dev->dev.kobj),
5562 static void netdev_adjacent_sysfs_del(struct net_device *dev,
5564 struct list_head *dev_list)
5566 char linkname[IFNAMSIZ+7];
5567 sprintf(linkname, dev_list == &dev->adj_list.upper ?
5568 "upper_%s" : "lower_%s", name);
5569 sysfs_remove_link(&(dev->dev.kobj), linkname);
5572 static inline bool netdev_adjacent_is_neigh_list(struct net_device *dev,
5573 struct net_device *adj_dev,
5574 struct list_head *dev_list)
5576 return (dev_list == &dev->adj_list.upper ||
5577 dev_list == &dev->adj_list.lower) &&
5578 net_eq(dev_net(dev), dev_net(adj_dev));
5581 static int __netdev_adjacent_dev_insert(struct net_device *dev,
5582 struct net_device *adj_dev,
5583 struct list_head *dev_list,
5584 void *private, bool master)
5586 struct netdev_adjacent *adj;
5589 adj = __netdev_find_adj(adj_dev, dev_list);
5596 adj = kmalloc(sizeof(*adj), GFP_KERNEL);
5601 adj->master = master;
5603 adj->private = private;
5606 pr_debug("dev_hold for %s, because of link added from %s to %s\n",
5607 adj_dev->name, dev->name, adj_dev->name);
5609 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list)) {
5610 ret = netdev_adjacent_sysfs_add(dev, adj_dev, dev_list);
5615 /* Ensure that master link is always the first item in list. */
5617 ret = sysfs_create_link(&(dev->dev.kobj),
5618 &(adj_dev->dev.kobj), "master");
5620 goto remove_symlinks;
5622 list_add_rcu(&adj->list, dev_list);
5624 list_add_tail_rcu(&adj->list, dev_list);
5630 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
5631 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
5639 static void __netdev_adjacent_dev_remove(struct net_device *dev,
5640 struct net_device *adj_dev,
5641 struct list_head *dev_list)
5643 struct netdev_adjacent *adj;
5645 adj = __netdev_find_adj(adj_dev, dev_list);
5648 pr_err("tried to remove device %s from %s\n",
5649 dev->name, adj_dev->name);
5653 if (adj->ref_nr > 1) {
5654 pr_debug("%s to %s ref_nr-- = %d\n", dev->name, adj_dev->name,
5661 sysfs_remove_link(&(dev->dev.kobj), "master");
5663 if (netdev_adjacent_is_neigh_list(dev, adj_dev, dev_list))
5664 netdev_adjacent_sysfs_del(dev, adj_dev->name, dev_list);
5666 list_del_rcu(&adj->list);
5667 pr_debug("dev_put for %s, because link removed from %s to %s\n",
5668 adj_dev->name, dev->name, adj_dev->name);
5670 kfree_rcu(adj, rcu);
5673 static int __netdev_adjacent_dev_link_lists(struct net_device *dev,
5674 struct net_device *upper_dev,
5675 struct list_head *up_list,
5676 struct list_head *down_list,
5677 void *private, bool master)
5681 ret = __netdev_adjacent_dev_insert(dev, upper_dev, up_list, private,
5686 ret = __netdev_adjacent_dev_insert(upper_dev, dev, down_list, private,
5689 __netdev_adjacent_dev_remove(dev, upper_dev, up_list);
5696 static int __netdev_adjacent_dev_link(struct net_device *dev,
5697 struct net_device *upper_dev)
5699 return __netdev_adjacent_dev_link_lists(dev, upper_dev,
5700 &dev->all_adj_list.upper,
5701 &upper_dev->all_adj_list.lower,
5705 static void __netdev_adjacent_dev_unlink_lists(struct net_device *dev,
5706 struct net_device *upper_dev,
5707 struct list_head *up_list,
5708 struct list_head *down_list)
5710 __netdev_adjacent_dev_remove(dev, upper_dev, up_list);
5711 __netdev_adjacent_dev_remove(upper_dev, dev, down_list);
5714 static void __netdev_adjacent_dev_unlink(struct net_device *dev,
5715 struct net_device *upper_dev)
5717 __netdev_adjacent_dev_unlink_lists(dev, upper_dev,
5718 &dev->all_adj_list.upper,
5719 &upper_dev->all_adj_list.lower);
5722 static int __netdev_adjacent_dev_link_neighbour(struct net_device *dev,
5723 struct net_device *upper_dev,
5724 void *private, bool master)
5726 int ret = __netdev_adjacent_dev_link(dev, upper_dev);
5731 ret = __netdev_adjacent_dev_link_lists(dev, upper_dev,
5732 &dev->adj_list.upper,
5733 &upper_dev->adj_list.lower,
5736 __netdev_adjacent_dev_unlink(dev, upper_dev);
5743 static void __netdev_adjacent_dev_unlink_neighbour(struct net_device *dev,
5744 struct net_device *upper_dev)
5746 __netdev_adjacent_dev_unlink(dev, upper_dev);
5747 __netdev_adjacent_dev_unlink_lists(dev, upper_dev,
5748 &dev->adj_list.upper,
5749 &upper_dev->adj_list.lower);
5752 static int __netdev_upper_dev_link(struct net_device *dev,
5753 struct net_device *upper_dev, bool master,
5754 void *upper_priv, void *upper_info)
5756 struct netdev_notifier_changeupper_info changeupper_info;
5757 struct netdev_adjacent *i, *j, *to_i, *to_j;
5762 if (dev == upper_dev)
5765 /* To prevent loops, check if dev is not upper device to upper_dev. */
5766 if (__netdev_find_adj(dev, &upper_dev->all_adj_list.upper))
5769 if (__netdev_find_adj(upper_dev, &dev->adj_list.upper))
5772 if (master && netdev_master_upper_dev_get(dev))
5775 changeupper_info.upper_dev = upper_dev;
5776 changeupper_info.master = master;
5777 changeupper_info.linking = true;
5778 changeupper_info.upper_info = upper_info;
5780 ret = call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev,
5781 &changeupper_info.info);
5782 ret = notifier_to_errno(ret);
5786 ret = __netdev_adjacent_dev_link_neighbour(dev, upper_dev, upper_priv,
5791 /* Now that we linked these devs, make all the upper_dev's
5792 * all_adj_list.upper visible to every dev's all_adj_list.lower an
5793 * versa, and don't forget the devices itself. All of these
5794 * links are non-neighbours.
5796 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5797 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) {
5798 pr_debug("Interlinking %s with %s, non-neighbour\n",
5799 i->dev->name, j->dev->name);
5800 ret = __netdev_adjacent_dev_link(i->dev, j->dev);
5806 /* add dev to every upper_dev's upper device */
5807 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) {
5808 pr_debug("linking %s's upper device %s with %s\n",
5809 upper_dev->name, i->dev->name, dev->name);
5810 ret = __netdev_adjacent_dev_link(dev, i->dev);
5812 goto rollback_upper_mesh;
5815 /* add upper_dev to every dev's lower device */
5816 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5817 pr_debug("linking %s's lower device %s with %s\n", dev->name,
5818 i->dev->name, upper_dev->name);
5819 ret = __netdev_adjacent_dev_link(i->dev, upper_dev);
5821 goto rollback_lower_mesh;
5824 ret = call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev,
5825 &changeupper_info.info);
5826 ret = notifier_to_errno(ret);
5828 goto rollback_lower_mesh;
5832 rollback_lower_mesh:
5834 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5837 __netdev_adjacent_dev_unlink(i->dev, upper_dev);
5842 rollback_upper_mesh:
5844 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list) {
5847 __netdev_adjacent_dev_unlink(dev, i->dev);
5855 list_for_each_entry(i, &dev->all_adj_list.lower, list) {
5856 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list) {
5857 if (i == to_i && j == to_j)
5859 __netdev_adjacent_dev_unlink(i->dev, j->dev);
5865 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
5871 * netdev_upper_dev_link - Add a link to the upper device
5873 * @upper_dev: new upper device
5875 * Adds a link to device which is upper to this one. The caller must hold
5876 * the RTNL lock. On a failure a negative errno code is returned.
5877 * On success the reference counts are adjusted and the function
5880 int netdev_upper_dev_link(struct net_device *dev,
5881 struct net_device *upper_dev)
5883 return __netdev_upper_dev_link(dev, upper_dev, false, NULL, NULL);
5885 EXPORT_SYMBOL(netdev_upper_dev_link);
5888 * netdev_master_upper_dev_link - Add a master link to the upper device
5890 * @upper_dev: new upper device
5891 * @upper_priv: upper device private
5892 * @upper_info: upper info to be passed down via notifier
5894 * Adds a link to device which is upper to this one. In this case, only
5895 * one master upper device can be linked, although other non-master devices
5896 * might be linked as well. The caller must hold the RTNL lock.
5897 * On a failure a negative errno code is returned. On success the reference
5898 * counts are adjusted and the function returns zero.
5900 int netdev_master_upper_dev_link(struct net_device *dev,
5901 struct net_device *upper_dev,
5902 void *upper_priv, void *upper_info)
5904 return __netdev_upper_dev_link(dev, upper_dev, true,
5905 upper_priv, upper_info);
5907 EXPORT_SYMBOL(netdev_master_upper_dev_link);
5910 * netdev_upper_dev_unlink - Removes a link to upper device
5912 * @upper_dev: new upper device
5914 * Removes a link to device which is upper to this one. The caller must hold
5917 void netdev_upper_dev_unlink(struct net_device *dev,
5918 struct net_device *upper_dev)
5920 struct netdev_notifier_changeupper_info changeupper_info;
5921 struct netdev_adjacent *i, *j;
5924 changeupper_info.upper_dev = upper_dev;
5925 changeupper_info.master = netdev_master_upper_dev_get(dev) == upper_dev;
5926 changeupper_info.linking = false;
5928 call_netdevice_notifiers_info(NETDEV_PRECHANGEUPPER, dev,
5929 &changeupper_info.info);
5931 __netdev_adjacent_dev_unlink_neighbour(dev, upper_dev);
5933 /* Here is the tricky part. We must remove all dev's lower
5934 * devices from all upper_dev's upper devices and vice
5935 * versa, to maintain the graph relationship.
5937 list_for_each_entry(i, &dev->all_adj_list.lower, list)
5938 list_for_each_entry(j, &upper_dev->all_adj_list.upper, list)
5939 __netdev_adjacent_dev_unlink(i->dev, j->dev);
5941 /* remove also the devices itself from lower/upper device
5944 list_for_each_entry(i, &dev->all_adj_list.lower, list)
5945 __netdev_adjacent_dev_unlink(i->dev, upper_dev);
5947 list_for_each_entry(i, &upper_dev->all_adj_list.upper, list)
5948 __netdev_adjacent_dev_unlink(dev, i->dev);
5950 call_netdevice_notifiers_info(NETDEV_CHANGEUPPER, dev,
5951 &changeupper_info.info);
5953 EXPORT_SYMBOL(netdev_upper_dev_unlink);
5956 * netdev_bonding_info_change - Dispatch event about slave change
5958 * @bonding_info: info to dispatch
5960 * Send NETDEV_BONDING_INFO to netdev notifiers with info.
5961 * The caller must hold the RTNL lock.
5963 void netdev_bonding_info_change(struct net_device *dev,
5964 struct netdev_bonding_info *bonding_info)
5966 struct netdev_notifier_bonding_info info;
5968 memcpy(&info.bonding_info, bonding_info,
5969 sizeof(struct netdev_bonding_info));
5970 call_netdevice_notifiers_info(NETDEV_BONDING_INFO, dev,
5973 EXPORT_SYMBOL(netdev_bonding_info_change);
5975 static void netdev_adjacent_add_links(struct net_device *dev)
5977 struct netdev_adjacent *iter;
5979 struct net *net = dev_net(dev);
5981 list_for_each_entry(iter, &dev->adj_list.upper, list) {
5982 if (!net_eq(net, dev_net(iter->dev)))
5984 netdev_adjacent_sysfs_add(iter->dev, dev,
5985 &iter->dev->adj_list.lower);
5986 netdev_adjacent_sysfs_add(dev, iter->dev,
5987 &dev->adj_list.upper);
5990 list_for_each_entry(iter, &dev->adj_list.lower, list) {
5991 if (!net_eq(net, dev_net(iter->dev)))
5993 netdev_adjacent_sysfs_add(iter->dev, dev,
5994 &iter->dev->adj_list.upper);
5995 netdev_adjacent_sysfs_add(dev, iter->dev,
5996 &dev->adj_list.lower);
6000 static void netdev_adjacent_del_links(struct net_device *dev)
6002 struct netdev_adjacent *iter;
6004 struct net *net = dev_net(dev);
6006 list_for_each_entry(iter, &dev->adj_list.upper, list) {
6007 if (!net_eq(net, dev_net(iter->dev)))
6009 netdev_adjacent_sysfs_del(iter->dev, dev->name,
6010 &iter->dev->adj_list.lower);
6011 netdev_adjacent_sysfs_del(dev, iter->dev->name,
6012 &dev->adj_list.upper);
6015 list_for_each_entry(iter, &dev->adj_list.lower, list) {
6016 if (!net_eq(net, dev_net(iter->dev)))
6018 netdev_adjacent_sysfs_del(iter->dev, dev->name,
6019 &iter->dev->adj_list.upper);
6020 netdev_adjacent_sysfs_del(dev, iter->dev->name,
6021 &dev->adj_list.lower);
6025 void netdev_adjacent_rename_links(struct net_device *dev, char *oldname)
6027 struct netdev_adjacent *iter;
6029 struct net *net = dev_net(dev);
6031 list_for_each_entry(iter, &dev->adj_list.upper, list) {
6032 if (!net_eq(net, dev_net(iter->dev)))
6034 netdev_adjacent_sysfs_del(iter->dev, oldname,
6035 &iter->dev->adj_list.lower);
6036 netdev_adjacent_sysfs_add(iter->dev, dev,
6037 &iter->dev->adj_list.lower);
6040 list_for_each_entry(iter, &dev->adj_list.lower, list) {
6041 if (!net_eq(net, dev_net(iter->dev)))
6043 netdev_adjacent_sysfs_del(iter->dev, oldname,
6044 &iter->dev->adj_list.upper);
6045 netdev_adjacent_sysfs_add(iter->dev, dev,
6046 &iter->dev->adj_list.upper);
6050 void *netdev_lower_dev_get_private(struct net_device *dev,
6051 struct net_device *lower_dev)
6053 struct netdev_adjacent *lower;
6057 lower = __netdev_find_adj(lower_dev, &dev->adj_list.lower);
6061 return lower->private;
6063 EXPORT_SYMBOL(netdev_lower_dev_get_private);
6066 int dev_get_nest_level(struct net_device *dev)
6068 struct net_device *lower = NULL;
6069 struct list_head *iter;
6075 netdev_for_each_lower_dev(dev, lower, iter) {
6076 nest = dev_get_nest_level(lower);
6077 if (max_nest < nest)
6081 return max_nest + 1;
6083 EXPORT_SYMBOL(dev_get_nest_level);
6086 * netdev_lower_change - Dispatch event about lower device state change
6087 * @lower_dev: device
6088 * @lower_state_info: state to dispatch
6090 * Send NETDEV_CHANGELOWERSTATE to netdev notifiers with info.
6091 * The caller must hold the RTNL lock.
6093 void netdev_lower_state_changed(struct net_device *lower_dev,
6094 void *lower_state_info)
6096 struct netdev_notifier_changelowerstate_info changelowerstate_info;
6099 changelowerstate_info.lower_state_info = lower_state_info;
6100 call_netdevice_notifiers_info(NETDEV_CHANGELOWERSTATE, lower_dev,
6101 &changelowerstate_info.info);
6103 EXPORT_SYMBOL(netdev_lower_state_changed);
6105 int netdev_default_l2upper_neigh_construct(struct net_device *dev,
6106 struct neighbour *n)
6108 struct net_device *lower_dev, *stop_dev;
6109 struct list_head *iter;
6112 netdev_for_each_lower_dev(dev, lower_dev, iter) {
6113 if (!lower_dev->netdev_ops->ndo_neigh_construct)
6115 err = lower_dev->netdev_ops->ndo_neigh_construct(lower_dev, n);
6117 stop_dev = lower_dev;
6124 netdev_for_each_lower_dev(dev, lower_dev, iter) {
6125 if (lower_dev == stop_dev)
6127 if (!lower_dev->netdev_ops->ndo_neigh_destroy)
6129 lower_dev->netdev_ops->ndo_neigh_destroy(lower_dev, n);
6133 EXPORT_SYMBOL_GPL(netdev_default_l2upper_neigh_construct);
6135 void netdev_default_l2upper_neigh_destroy(struct net_device *dev,
6136 struct neighbour *n)
6138 struct net_device *lower_dev;
6139 struct list_head *iter;
6141 netdev_for_each_lower_dev(dev, lower_dev, iter) {
6142 if (!lower_dev->netdev_ops->ndo_neigh_destroy)
6144 lower_dev->netdev_ops->ndo_neigh_destroy(lower_dev, n);
6147 EXPORT_SYMBOL_GPL(netdev_default_l2upper_neigh_destroy);
6149 static void dev_change_rx_flags(struct net_device *dev, int flags)
6151 const struct net_device_ops *ops = dev->netdev_ops;
6153 if (ops->ndo_change_rx_flags)
6154 ops->ndo_change_rx_flags(dev, flags);
6157 static int __dev_set_promiscuity(struct net_device *dev, int inc, bool notify)
6159 unsigned int old_flags = dev->flags;
6165 dev->flags |= IFF_PROMISC;
6166 dev->promiscuity += inc;
6167 if (dev->promiscuity == 0) {
6170 * If inc causes overflow, untouch promisc and return error.
6173 dev->flags &= ~IFF_PROMISC;
6175 dev->promiscuity -= inc;
6176 pr_warn("%s: promiscuity touches roof, set promiscuity failed. promiscuity feature of device might be broken.\n",
6181 if (dev->flags != old_flags) {
6182 pr_info("device %s %s promiscuous mode\n",
6184 dev->flags & IFF_PROMISC ? "entered" : "left");
6185 if (audit_enabled) {
6186 current_uid_gid(&uid, &gid);
6187 audit_log(current->audit_context, GFP_ATOMIC,
6188 AUDIT_ANOM_PROMISCUOUS,
6189 "dev=%s prom=%d old_prom=%d auid=%u uid=%u gid=%u ses=%u",
6190 dev->name, (dev->flags & IFF_PROMISC),
6191 (old_flags & IFF_PROMISC),
6192 from_kuid(&init_user_ns, audit_get_loginuid(current)),
6193 from_kuid(&init_user_ns, uid),
6194 from_kgid(&init_user_ns, gid),
6195 audit_get_sessionid(current));
6198 dev_change_rx_flags(dev, IFF_PROMISC);
6201 __dev_notify_flags(dev, old_flags, IFF_PROMISC);
6206 * dev_set_promiscuity - update promiscuity count on a device
6210 * Add or remove promiscuity from a device. While the count in the device
6211 * remains above zero the interface remains promiscuous. Once it hits zero
6212 * the device reverts back to normal filtering operation. A negative inc
6213 * value is used to drop promiscuity on the device.
6214 * Return 0 if successful or a negative errno code on error.
6216 int dev_set_promiscuity(struct net_device *dev, int inc)
6218 unsigned int old_flags = dev->flags;
6221 err = __dev_set_promiscuity(dev, inc, true);
6224 if (dev->flags != old_flags)
6225 dev_set_rx_mode(dev);
6228 EXPORT_SYMBOL(dev_set_promiscuity);
6230 static int __dev_set_allmulti(struct net_device *dev, int inc, bool notify)
6232 unsigned int old_flags = dev->flags, old_gflags = dev->gflags;
6236 dev->flags |= IFF_ALLMULTI;
6237 dev->allmulti += inc;
6238 if (dev->allmulti == 0) {
6241 * If inc causes overflow, untouch allmulti and return error.
6244 dev->flags &= ~IFF_ALLMULTI;
6246 dev->allmulti -= inc;
6247 pr_warn("%s: allmulti touches roof, set allmulti failed. allmulti feature of device might be broken.\n",
6252 if (dev->flags ^ old_flags) {
6253 dev_change_rx_flags(dev, IFF_ALLMULTI);
6254 dev_set_rx_mode(dev);
6256 __dev_notify_flags(dev, old_flags,
6257 dev->gflags ^ old_gflags);
6263 * dev_set_allmulti - update allmulti count on a device
6267 * Add or remove reception of all multicast frames to a device. While the
6268 * count in the device remains above zero the interface remains listening
6269 * to all interfaces. Once it hits zero the device reverts back to normal
6270 * filtering operation. A negative @inc value is used to drop the counter
6271 * when releasing a resource needing all multicasts.
6272 * Return 0 if successful or a negative errno code on error.
6275 int dev_set_allmulti(struct net_device *dev, int inc)
6277 return __dev_set_allmulti(dev, inc, true);
6279 EXPORT_SYMBOL(dev_set_allmulti);
6282 * Upload unicast and multicast address lists to device and
6283 * configure RX filtering. When the device doesn't support unicast
6284 * filtering it is put in promiscuous mode while unicast addresses
6287 void __dev_set_rx_mode(struct net_device *dev)
6289 const struct net_device_ops *ops = dev->netdev_ops;
6291 /* dev_open will call this function so the list will stay sane. */
6292 if (!(dev->flags&IFF_UP))
6295 if (!netif_device_present(dev))
6298 if (!(dev->priv_flags & IFF_UNICAST_FLT)) {
6299 /* Unicast addresses changes may only happen under the rtnl,
6300 * therefore calling __dev_set_promiscuity here is safe.
6302 if (!netdev_uc_empty(dev) && !dev->uc_promisc) {
6303 __dev_set_promiscuity(dev, 1, false);
6304 dev->uc_promisc = true;
6305 } else if (netdev_uc_empty(dev) && dev->uc_promisc) {
6306 __dev_set_promiscuity(dev, -1, false);
6307 dev->uc_promisc = false;
6311 if (ops->ndo_set_rx_mode)
6312 ops->ndo_set_rx_mode(dev);
6315 void dev_set_rx_mode(struct net_device *dev)
6317 netif_addr_lock_bh(dev);
6318 __dev_set_rx_mode(dev);
6319 netif_addr_unlock_bh(dev);
6323 * dev_get_flags - get flags reported to userspace
6326 * Get the combination of flag bits exported through APIs to userspace.
6328 unsigned int dev_get_flags(const struct net_device *dev)
6332 flags = (dev->flags & ~(IFF_PROMISC |
6337 (dev->gflags & (IFF_PROMISC |
6340 if (netif_running(dev)) {
6341 if (netif_oper_up(dev))
6342 flags |= IFF_RUNNING;
6343 if (netif_carrier_ok(dev))
6344 flags |= IFF_LOWER_UP;
6345 if (netif_dormant(dev))
6346 flags |= IFF_DORMANT;
6351 EXPORT_SYMBOL(dev_get_flags);
6353 int __dev_change_flags(struct net_device *dev, unsigned int flags)
6355 unsigned int old_flags = dev->flags;
6361 * Set the flags on our device.
6364 dev->flags = (flags & (IFF_DEBUG | IFF_NOTRAILERS | IFF_NOARP |
6365 IFF_DYNAMIC | IFF_MULTICAST | IFF_PORTSEL |
6367 (dev->flags & (IFF_UP | IFF_VOLATILE | IFF_PROMISC |
6371 * Load in the correct multicast list now the flags have changed.
6374 if ((old_flags ^ flags) & IFF_MULTICAST)
6375 dev_change_rx_flags(dev, IFF_MULTICAST);
6377 dev_set_rx_mode(dev);
6380 * Have we downed the interface. We handle IFF_UP ourselves
6381 * according to user attempts to set it, rather than blindly
6386 if ((old_flags ^ flags) & IFF_UP)
6387 ret = ((old_flags & IFF_UP) ? __dev_close : __dev_open)(dev);
6389 if ((flags ^ dev->gflags) & IFF_PROMISC) {
6390 int inc = (flags & IFF_PROMISC) ? 1 : -1;
6391 unsigned int old_flags = dev->flags;
6393 dev->gflags ^= IFF_PROMISC;
6395 if (__dev_set_promiscuity(dev, inc, false) >= 0)
6396 if (dev->flags != old_flags)
6397 dev_set_rx_mode(dev);
6400 /* NOTE: order of synchronization of IFF_PROMISC and IFF_ALLMULTI
6401 is important. Some (broken) drivers set IFF_PROMISC, when
6402 IFF_ALLMULTI is requested not asking us and not reporting.
6404 if ((flags ^ dev->gflags) & IFF_ALLMULTI) {
6405 int inc = (flags & IFF_ALLMULTI) ? 1 : -1;
6407 dev->gflags ^= IFF_ALLMULTI;
6408 __dev_set_allmulti(dev, inc, false);
6414 void __dev_notify_flags(struct net_device *dev, unsigned int old_flags,
6415 unsigned int gchanges)
6417 unsigned int changes = dev->flags ^ old_flags;
6420 rtmsg_ifinfo(RTM_NEWLINK, dev, gchanges, GFP_ATOMIC);
6422 if (changes & IFF_UP) {
6423 if (dev->flags & IFF_UP)
6424 call_netdevice_notifiers(NETDEV_UP, dev);
6426 call_netdevice_notifiers(NETDEV_DOWN, dev);
6429 if (dev->flags & IFF_UP &&
6430 (changes & ~(IFF_UP | IFF_PROMISC | IFF_ALLMULTI | IFF_VOLATILE))) {
6431 struct netdev_notifier_change_info change_info;
6433 change_info.flags_changed = changes;
6434 call_netdevice_notifiers_info(NETDEV_CHANGE, dev,
6440 * dev_change_flags - change device settings
6442 * @flags: device state flags
6444 * Change settings on device based state flags. The flags are
6445 * in the userspace exported format.
6447 int dev_change_flags(struct net_device *dev, unsigned int flags)
6450 unsigned int changes, old_flags = dev->flags, old_gflags = dev->gflags;
6452 ret = __dev_change_flags(dev, flags);
6456 changes = (old_flags ^ dev->flags) | (old_gflags ^ dev->gflags);
6457 __dev_notify_flags(dev, old_flags, changes);
6460 EXPORT_SYMBOL(dev_change_flags);
6462 static int __dev_set_mtu(struct net_device *dev, int new_mtu)
6464 const struct net_device_ops *ops = dev->netdev_ops;
6466 if (ops->ndo_change_mtu)
6467 return ops->ndo_change_mtu(dev, new_mtu);
6474 * dev_set_mtu - Change maximum transfer unit
6476 * @new_mtu: new transfer unit
6478 * Change the maximum transfer size of the network device.
6480 int dev_set_mtu(struct net_device *dev, int new_mtu)
6484 if (new_mtu == dev->mtu)
6487 /* MTU must be positive. */
6491 if (!netif_device_present(dev))
6494 err = call_netdevice_notifiers(NETDEV_PRECHANGEMTU, dev);
6495 err = notifier_to_errno(err);
6499 orig_mtu = dev->mtu;
6500 err = __dev_set_mtu(dev, new_mtu);
6503 err = call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
6504 err = notifier_to_errno(err);
6506 /* setting mtu back and notifying everyone again,
6507 * so that they have a chance to revert changes.
6509 __dev_set_mtu(dev, orig_mtu);
6510 call_netdevice_notifiers(NETDEV_CHANGEMTU, dev);
6515 EXPORT_SYMBOL(dev_set_mtu);
6518 * dev_set_group - Change group this device belongs to
6520 * @new_group: group this device should belong to
6522 void dev_set_group(struct net_device *dev, int new_group)
6524 dev->group = new_group;
6526 EXPORT_SYMBOL(dev_set_group);
6529 * dev_set_mac_address - Change Media Access Control Address
6533 * Change the hardware (MAC) address of the device
6535 int dev_set_mac_address(struct net_device *dev, struct sockaddr *sa)
6537 const struct net_device_ops *ops = dev->netdev_ops;
6540 if (!ops->ndo_set_mac_address)
6542 if (sa->sa_family != dev->type)
6544 if (!netif_device_present(dev))
6546 err = ops->ndo_set_mac_address(dev, sa);
6549 dev->addr_assign_type = NET_ADDR_SET;
6550 call_netdevice_notifiers(NETDEV_CHANGEADDR, dev);
6551 add_device_randomness(dev->dev_addr, dev->addr_len);
6554 EXPORT_SYMBOL(dev_set_mac_address);
6557 * dev_change_carrier - Change device carrier
6559 * @new_carrier: new value
6561 * Change device carrier
6563 int dev_change_carrier(struct net_device *dev, bool new_carrier)
6565 const struct net_device_ops *ops = dev->netdev_ops;
6567 if (!ops->ndo_change_carrier)
6569 if (!netif_device_present(dev))
6571 return ops->ndo_change_carrier(dev, new_carrier);
6573 EXPORT_SYMBOL(dev_change_carrier);
6576 * dev_get_phys_port_id - Get device physical port ID
6580 * Get device physical port ID
6582 int dev_get_phys_port_id(struct net_device *dev,
6583 struct netdev_phys_item_id *ppid)
6585 const struct net_device_ops *ops = dev->netdev_ops;
6587 if (!ops->ndo_get_phys_port_id)
6589 return ops->ndo_get_phys_port_id(dev, ppid);
6591 EXPORT_SYMBOL(dev_get_phys_port_id);
6594 * dev_get_phys_port_name - Get device physical port name
6597 * @len: limit of bytes to copy to name
6599 * Get device physical port name
6601 int dev_get_phys_port_name(struct net_device *dev,
6602 char *name, size_t len)
6604 const struct net_device_ops *ops = dev->netdev_ops;
6606 if (!ops->ndo_get_phys_port_name)
6608 return ops->ndo_get_phys_port_name(dev, name, len);
6610 EXPORT_SYMBOL(dev_get_phys_port_name);
6613 * dev_change_proto_down - update protocol port state information
6615 * @proto_down: new value
6617 * This info can be used by switch drivers to set the phys state of the
6620 int dev_change_proto_down(struct net_device *dev, bool proto_down)
6622 const struct net_device_ops *ops = dev->netdev_ops;
6624 if (!ops->ndo_change_proto_down)
6626 if (!netif_device_present(dev))
6628 return ops->ndo_change_proto_down(dev, proto_down);
6630 EXPORT_SYMBOL(dev_change_proto_down);
6633 * dev_change_xdp_fd - set or clear a bpf program for a device rx path
6635 * @fd: new program fd or negative value to clear
6637 * Set or clear a bpf program for a device
6639 int dev_change_xdp_fd(struct net_device *dev, int fd)
6641 const struct net_device_ops *ops = dev->netdev_ops;
6642 struct bpf_prog *prog = NULL;
6643 struct netdev_xdp xdp = {};
6649 prog = bpf_prog_get_type(fd, BPF_PROG_TYPE_XDP);
6651 return PTR_ERR(prog);
6654 xdp.command = XDP_SETUP_PROG;
6656 err = ops->ndo_xdp(dev, &xdp);
6657 if (err < 0 && prog)
6662 EXPORT_SYMBOL(dev_change_xdp_fd);
6665 * dev_new_index - allocate an ifindex
6666 * @net: the applicable net namespace
6668 * Returns a suitable unique value for a new device interface
6669 * number. The caller must hold the rtnl semaphore or the
6670 * dev_base_lock to be sure it remains unique.
6672 static int dev_new_index(struct net *net)
6674 int ifindex = net->ifindex;
6678 if (!__dev_get_by_index(net, ifindex))
6679 return net->ifindex = ifindex;
6683 /* Delayed registration/unregisteration */
6684 static LIST_HEAD(net_todo_list);
6685 DECLARE_WAIT_QUEUE_HEAD(netdev_unregistering_wq);
6687 static void net_set_todo(struct net_device *dev)
6689 list_add_tail(&dev->todo_list, &net_todo_list);
6690 dev_net(dev)->dev_unreg_count++;
6693 static void rollback_registered_many(struct list_head *head)
6695 struct net_device *dev, *tmp;
6696 LIST_HEAD(close_head);
6698 BUG_ON(dev_boot_phase);
6701 list_for_each_entry_safe(dev, tmp, head, unreg_list) {
6702 /* Some devices call without registering
6703 * for initialization unwind. Remove those
6704 * devices and proceed with the remaining.
6706 if (dev->reg_state == NETREG_UNINITIALIZED) {
6707 pr_debug("unregister_netdevice: device %s/%p never was registered\n",
6711 list_del(&dev->unreg_list);
6714 dev->dismantle = true;
6715 BUG_ON(dev->reg_state != NETREG_REGISTERED);
6718 /* If device is running, close it first. */
6719 list_for_each_entry(dev, head, unreg_list)
6720 list_add_tail(&dev->close_list, &close_head);
6721 dev_close_many(&close_head, true);
6723 list_for_each_entry(dev, head, unreg_list) {
6724 /* And unlink it from device chain. */
6725 unlist_netdevice(dev);
6727 dev->reg_state = NETREG_UNREGISTERING;
6728 flush_all_backlogs(dev);
6733 list_for_each_entry(dev, head, unreg_list) {
6734 struct sk_buff *skb = NULL;
6736 /* Shutdown queueing discipline. */
6740 /* Notify protocols, that we are about to destroy
6741 this device. They should clean all the things.
6743 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
6745 if (!dev->rtnl_link_ops ||
6746 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
6747 skb = rtmsg_ifinfo_build_skb(RTM_DELLINK, dev, ~0U,
6751 * Flush the unicast and multicast chains
6756 if (dev->netdev_ops->ndo_uninit)
6757 dev->netdev_ops->ndo_uninit(dev);
6760 rtmsg_ifinfo_send(skb, dev, GFP_KERNEL);
6762 /* Notifier chain MUST detach us all upper devices. */
6763 WARN_ON(netdev_has_any_upper_dev(dev));
6765 /* Remove entries from kobject tree */
6766 netdev_unregister_kobject(dev);
6768 /* Remove XPS queueing entries */
6769 netif_reset_xps_queues_gt(dev, 0);
6775 list_for_each_entry(dev, head, unreg_list)
6779 static void rollback_registered(struct net_device *dev)
6783 list_add(&dev->unreg_list, &single);
6784 rollback_registered_many(&single);
6788 static netdev_features_t netdev_sync_upper_features(struct net_device *lower,
6789 struct net_device *upper, netdev_features_t features)
6791 netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
6792 netdev_features_t feature;
6795 for_each_netdev_feature(&upper_disables, feature_bit) {
6796 feature = __NETIF_F_BIT(feature_bit);
6797 if (!(upper->wanted_features & feature)
6798 && (features & feature)) {
6799 netdev_dbg(lower, "Dropping feature %pNF, upper dev %s has it off.\n",
6800 &feature, upper->name);
6801 features &= ~feature;
6808 static void netdev_sync_lower_features(struct net_device *upper,
6809 struct net_device *lower, netdev_features_t features)
6811 netdev_features_t upper_disables = NETIF_F_UPPER_DISABLES;
6812 netdev_features_t feature;
6815 for_each_netdev_feature(&upper_disables, feature_bit) {
6816 feature = __NETIF_F_BIT(feature_bit);
6817 if (!(features & feature) && (lower->features & feature)) {
6818 netdev_dbg(upper, "Disabling feature %pNF on lower dev %s.\n",
6819 &feature, lower->name);
6820 lower->wanted_features &= ~feature;
6821 netdev_update_features(lower);
6823 if (unlikely(lower->features & feature))
6824 netdev_WARN(upper, "failed to disable %pNF on %s!\n",
6825 &feature, lower->name);
6830 static netdev_features_t netdev_fix_features(struct net_device *dev,
6831 netdev_features_t features)
6833 /* Fix illegal checksum combinations */
6834 if ((features & NETIF_F_HW_CSUM) &&
6835 (features & (NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM))) {
6836 netdev_warn(dev, "mixed HW and IP checksum settings.\n");
6837 features &= ~(NETIF_F_IP_CSUM|NETIF_F_IPV6_CSUM);
6840 /* TSO requires that SG is present as well. */
6841 if ((features & NETIF_F_ALL_TSO) && !(features & NETIF_F_SG)) {
6842 netdev_dbg(dev, "Dropping TSO features since no SG feature.\n");
6843 features &= ~NETIF_F_ALL_TSO;
6846 if ((features & NETIF_F_TSO) && !(features & NETIF_F_HW_CSUM) &&
6847 !(features & NETIF_F_IP_CSUM)) {
6848 netdev_dbg(dev, "Dropping TSO features since no CSUM feature.\n");
6849 features &= ~NETIF_F_TSO;
6850 features &= ~NETIF_F_TSO_ECN;
6853 if ((features & NETIF_F_TSO6) && !(features & NETIF_F_HW_CSUM) &&
6854 !(features & NETIF_F_IPV6_CSUM)) {
6855 netdev_dbg(dev, "Dropping TSO6 features since no CSUM feature.\n");
6856 features &= ~NETIF_F_TSO6;
6859 /* TSO with IPv4 ID mangling requires IPv4 TSO be enabled */
6860 if ((features & NETIF_F_TSO_MANGLEID) && !(features & NETIF_F_TSO))
6861 features &= ~NETIF_F_TSO_MANGLEID;
6863 /* TSO ECN requires that TSO is present as well. */
6864 if ((features & NETIF_F_ALL_TSO) == NETIF_F_TSO_ECN)
6865 features &= ~NETIF_F_TSO_ECN;
6867 /* Software GSO depends on SG. */
6868 if ((features & NETIF_F_GSO) && !(features & NETIF_F_SG)) {
6869 netdev_dbg(dev, "Dropping NETIF_F_GSO since no SG feature.\n");
6870 features &= ~NETIF_F_GSO;
6873 /* UFO needs SG and checksumming */
6874 if (features & NETIF_F_UFO) {
6875 /* maybe split UFO into V4 and V6? */
6876 if (!(features & NETIF_F_HW_CSUM) &&
6877 ((features & (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM)) !=
6878 (NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM))) {
6880 "Dropping NETIF_F_UFO since no checksum offload features.\n");
6881 features &= ~NETIF_F_UFO;
6884 if (!(features & NETIF_F_SG)) {
6886 "Dropping NETIF_F_UFO since no NETIF_F_SG feature.\n");
6887 features &= ~NETIF_F_UFO;
6891 /* GSO partial features require GSO partial be set */
6892 if ((features & dev->gso_partial_features) &&
6893 !(features & NETIF_F_GSO_PARTIAL)) {
6895 "Dropping partially supported GSO features since no GSO partial.\n");
6896 features &= ~dev->gso_partial_features;
6899 #ifdef CONFIG_NET_RX_BUSY_POLL
6900 if (dev->netdev_ops->ndo_busy_poll)
6901 features |= NETIF_F_BUSY_POLL;
6904 features &= ~NETIF_F_BUSY_POLL;
6909 int __netdev_update_features(struct net_device *dev)
6911 struct net_device *upper, *lower;
6912 netdev_features_t features;
6913 struct list_head *iter;
6918 features = netdev_get_wanted_features(dev);
6920 if (dev->netdev_ops->ndo_fix_features)
6921 features = dev->netdev_ops->ndo_fix_features(dev, features);
6923 /* driver might be less strict about feature dependencies */
6924 features = netdev_fix_features(dev, features);
6926 /* some features can't be enabled if they're off an an upper device */
6927 netdev_for_each_upper_dev_rcu(dev, upper, iter)
6928 features = netdev_sync_upper_features(dev, upper, features);
6930 if (dev->features == features)
6933 netdev_dbg(dev, "Features changed: %pNF -> %pNF\n",
6934 &dev->features, &features);
6936 if (dev->netdev_ops->ndo_set_features)
6937 err = dev->netdev_ops->ndo_set_features(dev, features);
6941 if (unlikely(err < 0)) {
6943 "set_features() failed (%d); wanted %pNF, left %pNF\n",
6944 err, &features, &dev->features);
6945 /* return non-0 since some features might have changed and
6946 * it's better to fire a spurious notification than miss it
6952 /* some features must be disabled on lower devices when disabled
6953 * on an upper device (think: bonding master or bridge)
6955 netdev_for_each_lower_dev(dev, lower, iter)
6956 netdev_sync_lower_features(dev, lower, features);
6959 dev->features = features;
6961 return err < 0 ? 0 : 1;
6965 * netdev_update_features - recalculate device features
6966 * @dev: the device to check
6968 * Recalculate dev->features set and send notifications if it
6969 * has changed. Should be called after driver or hardware dependent
6970 * conditions might have changed that influence the features.
6972 void netdev_update_features(struct net_device *dev)
6974 if (__netdev_update_features(dev))
6975 netdev_features_change(dev);
6977 EXPORT_SYMBOL(netdev_update_features);
6980 * netdev_change_features - recalculate device features
6981 * @dev: the device to check
6983 * Recalculate dev->features set and send notifications even
6984 * if they have not changed. Should be called instead of
6985 * netdev_update_features() if also dev->vlan_features might
6986 * have changed to allow the changes to be propagated to stacked
6989 void netdev_change_features(struct net_device *dev)
6991 __netdev_update_features(dev);
6992 netdev_features_change(dev);
6994 EXPORT_SYMBOL(netdev_change_features);
6997 * netif_stacked_transfer_operstate - transfer operstate
6998 * @rootdev: the root or lower level device to transfer state from
6999 * @dev: the device to transfer operstate to
7001 * Transfer operational state from root to device. This is normally
7002 * called when a stacking relationship exists between the root
7003 * device and the device(a leaf device).
7005 void netif_stacked_transfer_operstate(const struct net_device *rootdev,
7006 struct net_device *dev)
7008 if (rootdev->operstate == IF_OPER_DORMANT)
7009 netif_dormant_on(dev);
7011 netif_dormant_off(dev);
7013 if (netif_carrier_ok(rootdev)) {
7014 if (!netif_carrier_ok(dev))
7015 netif_carrier_on(dev);
7017 if (netif_carrier_ok(dev))
7018 netif_carrier_off(dev);
7021 EXPORT_SYMBOL(netif_stacked_transfer_operstate);
7024 static int netif_alloc_rx_queues(struct net_device *dev)
7026 unsigned int i, count = dev->num_rx_queues;
7027 struct netdev_rx_queue *rx;
7028 size_t sz = count * sizeof(*rx);
7032 rx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
7040 for (i = 0; i < count; i++)
7046 static void netdev_init_one_queue(struct net_device *dev,
7047 struct netdev_queue *queue, void *_unused)
7049 /* Initialize queue lock */
7050 spin_lock_init(&queue->_xmit_lock);
7051 netdev_set_xmit_lockdep_class(&queue->_xmit_lock, dev->type);
7052 queue->xmit_lock_owner = -1;
7053 netdev_queue_numa_node_write(queue, NUMA_NO_NODE);
7056 dql_init(&queue->dql, HZ);
7060 static void netif_free_tx_queues(struct net_device *dev)
7065 static int netif_alloc_netdev_queues(struct net_device *dev)
7067 unsigned int count = dev->num_tx_queues;
7068 struct netdev_queue *tx;
7069 size_t sz = count * sizeof(*tx);
7071 if (count < 1 || count > 0xffff)
7074 tx = kzalloc(sz, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
7082 netdev_for_each_tx_queue(dev, netdev_init_one_queue, NULL);
7083 spin_lock_init(&dev->tx_global_lock);
7088 void netif_tx_stop_all_queues(struct net_device *dev)
7092 for (i = 0; i < dev->num_tx_queues; i++) {
7093 struct netdev_queue *txq = netdev_get_tx_queue(dev, i);
7094 netif_tx_stop_queue(txq);
7097 EXPORT_SYMBOL(netif_tx_stop_all_queues);
7100 * register_netdevice - register a network device
7101 * @dev: device to register
7103 * Take a completed network device structure and add it to the kernel
7104 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
7105 * chain. 0 is returned on success. A negative errno code is returned
7106 * on a failure to set up the device, or if the name is a duplicate.
7108 * Callers must hold the rtnl semaphore. You may want
7109 * register_netdev() instead of this.
7112 * The locking appears insufficient to guarantee two parallel registers
7113 * will not get the same name.
7116 int register_netdevice(struct net_device *dev)
7119 struct net *net = dev_net(dev);
7121 BUG_ON(dev_boot_phase);
7126 /* When net_device's are persistent, this will be fatal. */
7127 BUG_ON(dev->reg_state != NETREG_UNINITIALIZED);
7130 spin_lock_init(&dev->addr_list_lock);
7131 netdev_set_addr_lockdep_class(dev);
7133 ret = dev_get_valid_name(net, dev, dev->name);
7137 /* Init, if this function is available */
7138 if (dev->netdev_ops->ndo_init) {
7139 ret = dev->netdev_ops->ndo_init(dev);
7147 if (((dev->hw_features | dev->features) &
7148 NETIF_F_HW_VLAN_CTAG_FILTER) &&
7149 (!dev->netdev_ops->ndo_vlan_rx_add_vid ||
7150 !dev->netdev_ops->ndo_vlan_rx_kill_vid)) {
7151 netdev_WARN(dev, "Buggy VLAN acceleration in driver!\n");
7158 dev->ifindex = dev_new_index(net);
7159 else if (__dev_get_by_index(net, dev->ifindex))
7162 /* Transfer changeable features to wanted_features and enable
7163 * software offloads (GSO and GRO).
7165 dev->hw_features |= NETIF_F_SOFT_FEATURES;
7166 dev->features |= NETIF_F_SOFT_FEATURES;
7167 dev->wanted_features = dev->features & dev->hw_features;
7169 if (!(dev->flags & IFF_LOOPBACK))
7170 dev->hw_features |= NETIF_F_NOCACHE_COPY;
7172 /* If IPv4 TCP segmentation offload is supported we should also
7173 * allow the device to enable segmenting the frame with the option
7174 * of ignoring a static IP ID value. This doesn't enable the
7175 * feature itself but allows the user to enable it later.
7177 if (dev->hw_features & NETIF_F_TSO)
7178 dev->hw_features |= NETIF_F_TSO_MANGLEID;
7179 if (dev->vlan_features & NETIF_F_TSO)
7180 dev->vlan_features |= NETIF_F_TSO_MANGLEID;
7181 if (dev->mpls_features & NETIF_F_TSO)
7182 dev->mpls_features |= NETIF_F_TSO_MANGLEID;
7183 if (dev->hw_enc_features & NETIF_F_TSO)
7184 dev->hw_enc_features |= NETIF_F_TSO_MANGLEID;
7186 /* Make NETIF_F_HIGHDMA inheritable to VLAN devices.
7188 dev->vlan_features |= NETIF_F_HIGHDMA;
7190 /* Make NETIF_F_SG inheritable to tunnel devices.
7192 dev->hw_enc_features |= NETIF_F_SG | NETIF_F_GSO_PARTIAL;
7194 /* Make NETIF_F_SG inheritable to MPLS.
7196 dev->mpls_features |= NETIF_F_SG;
7198 ret = call_netdevice_notifiers(NETDEV_POST_INIT, dev);
7199 ret = notifier_to_errno(ret);
7203 ret = netdev_register_kobject(dev);
7206 dev->reg_state = NETREG_REGISTERED;
7208 __netdev_update_features(dev);
7211 * Default initial state at registry is that the
7212 * device is present.
7215 set_bit(__LINK_STATE_PRESENT, &dev->state);
7217 linkwatch_init_dev(dev);
7219 dev_init_scheduler(dev);
7221 list_netdevice(dev);
7222 add_device_randomness(dev->dev_addr, dev->addr_len);
7224 /* If the device has permanent device address, driver should
7225 * set dev_addr and also addr_assign_type should be set to
7226 * NET_ADDR_PERM (default value).
7228 if (dev->addr_assign_type == NET_ADDR_PERM)
7229 memcpy(dev->perm_addr, dev->dev_addr, dev->addr_len);
7231 /* Notify protocols, that a new device appeared. */
7232 ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
7233 ret = notifier_to_errno(ret);
7235 rollback_registered(dev);
7236 dev->reg_state = NETREG_UNREGISTERED;
7239 * Prevent userspace races by waiting until the network
7240 * device is fully setup before sending notifications.
7242 if (!dev->rtnl_link_ops ||
7243 dev->rtnl_link_state == RTNL_LINK_INITIALIZED)
7244 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
7250 if (dev->netdev_ops->ndo_uninit)
7251 dev->netdev_ops->ndo_uninit(dev);
7254 EXPORT_SYMBOL(register_netdevice);
7257 * init_dummy_netdev - init a dummy network device for NAPI
7258 * @dev: device to init
7260 * This takes a network device structure and initialize the minimum
7261 * amount of fields so it can be used to schedule NAPI polls without
7262 * registering a full blown interface. This is to be used by drivers
7263 * that need to tie several hardware interfaces to a single NAPI
7264 * poll scheduler due to HW limitations.
7266 int init_dummy_netdev(struct net_device *dev)
7268 /* Clear everything. Note we don't initialize spinlocks
7269 * are they aren't supposed to be taken by any of the
7270 * NAPI code and this dummy netdev is supposed to be
7271 * only ever used for NAPI polls
7273 memset(dev, 0, sizeof(struct net_device));
7275 /* make sure we BUG if trying to hit standard
7276 * register/unregister code path
7278 dev->reg_state = NETREG_DUMMY;
7280 /* NAPI wants this */
7281 INIT_LIST_HEAD(&dev->napi_list);
7283 /* a dummy interface is started by default */
7284 set_bit(__LINK_STATE_PRESENT, &dev->state);
7285 set_bit(__LINK_STATE_START, &dev->state);
7287 /* Note : We dont allocate pcpu_refcnt for dummy devices,
7288 * because users of this 'device' dont need to change
7294 EXPORT_SYMBOL_GPL(init_dummy_netdev);
7298 * register_netdev - register a network device
7299 * @dev: device to register
7301 * Take a completed network device structure and add it to the kernel
7302 * interfaces. A %NETDEV_REGISTER message is sent to the netdev notifier
7303 * chain. 0 is returned on success. A negative errno code is returned
7304 * on a failure to set up the device, or if the name is a duplicate.
7306 * This is a wrapper around register_netdevice that takes the rtnl semaphore
7307 * and expands the device name if you passed a format string to
7310 int register_netdev(struct net_device *dev)
7315 err = register_netdevice(dev);
7319 EXPORT_SYMBOL(register_netdev);
7321 int netdev_refcnt_read(const struct net_device *dev)
7325 for_each_possible_cpu(i)
7326 refcnt += *per_cpu_ptr(dev->pcpu_refcnt, i);
7329 EXPORT_SYMBOL(netdev_refcnt_read);
7332 * netdev_wait_allrefs - wait until all references are gone.
7333 * @dev: target net_device
7335 * This is called when unregistering network devices.
7337 * Any protocol or device that holds a reference should register
7338 * for netdevice notification, and cleanup and put back the
7339 * reference if they receive an UNREGISTER event.
7340 * We can get stuck here if buggy protocols don't correctly
7343 static void netdev_wait_allrefs(struct net_device *dev)
7345 unsigned long rebroadcast_time, warning_time;
7348 linkwatch_forget_dev(dev);
7350 rebroadcast_time = warning_time = jiffies;
7351 refcnt = netdev_refcnt_read(dev);
7353 while (refcnt != 0) {
7354 if (time_after(jiffies, rebroadcast_time + 1 * HZ)) {
7357 /* Rebroadcast unregister notification */
7358 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
7364 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
7365 if (test_bit(__LINK_STATE_LINKWATCH_PENDING,
7367 /* We must not have linkwatch events
7368 * pending on unregister. If this
7369 * happens, we simply run the queue
7370 * unscheduled, resulting in a noop
7373 linkwatch_run_queue();
7378 rebroadcast_time = jiffies;
7383 refcnt = netdev_refcnt_read(dev);
7385 if (time_after(jiffies, warning_time + 10 * HZ)) {
7386 pr_emerg("unregister_netdevice: waiting for %s to become free. Usage count = %d\n",
7388 warning_time = jiffies;
7397 * register_netdevice(x1);
7398 * register_netdevice(x2);
7400 * unregister_netdevice(y1);
7401 * unregister_netdevice(y2);
7407 * We are invoked by rtnl_unlock().
7408 * This allows us to deal with problems:
7409 * 1) We can delete sysfs objects which invoke hotplug
7410 * without deadlocking with linkwatch via keventd.
7411 * 2) Since we run with the RTNL semaphore not held, we can sleep
7412 * safely in order to wait for the netdev refcnt to drop to zero.
7414 * We must not return until all unregister events added during
7415 * the interval the lock was held have been completed.
7417 void netdev_run_todo(void)
7419 struct list_head list;
7421 /* Snapshot list, allow later requests */
7422 list_replace_init(&net_todo_list, &list);
7427 /* Wait for rcu callbacks to finish before next phase */
7428 if (!list_empty(&list))
7431 while (!list_empty(&list)) {
7432 struct net_device *dev
7433 = list_first_entry(&list, struct net_device, todo_list);
7434 list_del(&dev->todo_list);
7437 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
7440 if (unlikely(dev->reg_state != NETREG_UNREGISTERING)) {
7441 pr_err("network todo '%s' but state %d\n",
7442 dev->name, dev->reg_state);
7447 dev->reg_state = NETREG_UNREGISTERED;
7449 netdev_wait_allrefs(dev);
7452 BUG_ON(netdev_refcnt_read(dev));
7453 BUG_ON(!list_empty(&dev->ptype_all));
7454 BUG_ON(!list_empty(&dev->ptype_specific));
7455 WARN_ON(rcu_access_pointer(dev->ip_ptr));
7456 WARN_ON(rcu_access_pointer(dev->ip6_ptr));
7457 WARN_ON(dev->dn_ptr);
7459 if (dev->destructor)
7460 dev->destructor(dev);
7462 /* Report a network device has been unregistered */
7464 dev_net(dev)->dev_unreg_count--;
7466 wake_up(&netdev_unregistering_wq);
7468 /* Free network device */
7469 kobject_put(&dev->dev.kobj);
7473 /* Convert net_device_stats to rtnl_link_stats64. rtnl_link_stats64 has
7474 * all the same fields in the same order as net_device_stats, with only
7475 * the type differing, but rtnl_link_stats64 may have additional fields
7476 * at the end for newer counters.
7478 void netdev_stats_to_stats64(struct rtnl_link_stats64 *stats64,
7479 const struct net_device_stats *netdev_stats)
7481 #if BITS_PER_LONG == 64
7482 BUILD_BUG_ON(sizeof(*stats64) < sizeof(*netdev_stats));
7483 memcpy(stats64, netdev_stats, sizeof(*stats64));
7484 /* zero out counters that only exist in rtnl_link_stats64 */
7485 memset((char *)stats64 + sizeof(*netdev_stats), 0,
7486 sizeof(*stats64) - sizeof(*netdev_stats));
7488 size_t i, n = sizeof(*netdev_stats) / sizeof(unsigned long);
7489 const unsigned long *src = (const unsigned long *)netdev_stats;
7490 u64 *dst = (u64 *)stats64;
7492 BUILD_BUG_ON(n > sizeof(*stats64) / sizeof(u64));
7493 for (i = 0; i < n; i++)
7495 /* zero out counters that only exist in rtnl_link_stats64 */
7496 memset((char *)stats64 + n * sizeof(u64), 0,
7497 sizeof(*stats64) - n * sizeof(u64));
7500 EXPORT_SYMBOL(netdev_stats_to_stats64);
7503 * dev_get_stats - get network device statistics
7504 * @dev: device to get statistics from
7505 * @storage: place to store stats
7507 * Get network statistics from device. Return @storage.
7508 * The device driver may provide its own method by setting
7509 * dev->netdev_ops->get_stats64 or dev->netdev_ops->get_stats;
7510 * otherwise the internal statistics structure is used.
7512 struct rtnl_link_stats64 *dev_get_stats(struct net_device *dev,
7513 struct rtnl_link_stats64 *storage)
7515 const struct net_device_ops *ops = dev->netdev_ops;
7517 if (ops->ndo_get_stats64) {
7518 memset(storage, 0, sizeof(*storage));
7519 ops->ndo_get_stats64(dev, storage);
7520 } else if (ops->ndo_get_stats) {
7521 netdev_stats_to_stats64(storage, ops->ndo_get_stats(dev));
7523 netdev_stats_to_stats64(storage, &dev->stats);
7525 storage->rx_dropped += atomic_long_read(&dev->rx_dropped);
7526 storage->tx_dropped += atomic_long_read(&dev->tx_dropped);
7527 storage->rx_nohandler += atomic_long_read(&dev->rx_nohandler);
7530 EXPORT_SYMBOL(dev_get_stats);
7532 struct netdev_queue *dev_ingress_queue_create(struct net_device *dev)
7534 struct netdev_queue *queue = dev_ingress_queue(dev);
7536 #ifdef CONFIG_NET_CLS_ACT
7539 queue = kzalloc(sizeof(*queue), GFP_KERNEL);
7542 netdev_init_one_queue(dev, queue, NULL);
7543 RCU_INIT_POINTER(queue->qdisc, &noop_qdisc);
7544 queue->qdisc_sleeping = &noop_qdisc;
7545 rcu_assign_pointer(dev->ingress_queue, queue);
7550 static const struct ethtool_ops default_ethtool_ops;
7552 void netdev_set_default_ethtool_ops(struct net_device *dev,
7553 const struct ethtool_ops *ops)
7555 if (dev->ethtool_ops == &default_ethtool_ops)
7556 dev->ethtool_ops = ops;
7558 EXPORT_SYMBOL_GPL(netdev_set_default_ethtool_ops);
7560 void netdev_freemem(struct net_device *dev)
7562 char *addr = (char *)dev - dev->padded;
7568 * alloc_netdev_mqs - allocate network device
7569 * @sizeof_priv: size of private data to allocate space for
7570 * @name: device name format string
7571 * @name_assign_type: origin of device name
7572 * @setup: callback to initialize device
7573 * @txqs: the number of TX subqueues to allocate
7574 * @rxqs: the number of RX subqueues to allocate
7576 * Allocates a struct net_device with private data area for driver use
7577 * and performs basic initialization. Also allocates subqueue structs
7578 * for each queue on the device.
7580 struct net_device *alloc_netdev_mqs(int sizeof_priv, const char *name,
7581 unsigned char name_assign_type,
7582 void (*setup)(struct net_device *),
7583 unsigned int txqs, unsigned int rxqs)
7585 struct net_device *dev;
7587 struct net_device *p;
7589 BUG_ON(strlen(name) >= sizeof(dev->name));
7592 pr_err("alloc_netdev: Unable to allocate device with zero queues\n");
7598 pr_err("alloc_netdev: Unable to allocate device with zero RX queues\n");
7603 alloc_size = sizeof(struct net_device);
7605 /* ensure 32-byte alignment of private area */
7606 alloc_size = ALIGN(alloc_size, NETDEV_ALIGN);
7607 alloc_size += sizeof_priv;
7609 /* ensure 32-byte alignment of whole construct */
7610 alloc_size += NETDEV_ALIGN - 1;
7612 p = kzalloc(alloc_size, GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
7614 p = vzalloc(alloc_size);
7618 dev = PTR_ALIGN(p, NETDEV_ALIGN);
7619 dev->padded = (char *)dev - (char *)p;
7621 dev->pcpu_refcnt = alloc_percpu(int);
7622 if (!dev->pcpu_refcnt)
7625 if (dev_addr_init(dev))
7631 dev_net_set(dev, &init_net);
7633 dev->gso_max_size = GSO_MAX_SIZE;
7634 dev->gso_max_segs = GSO_MAX_SEGS;
7636 INIT_LIST_HEAD(&dev->napi_list);
7637 INIT_LIST_HEAD(&dev->unreg_list);
7638 INIT_LIST_HEAD(&dev->close_list);
7639 INIT_LIST_HEAD(&dev->link_watch_list);
7640 INIT_LIST_HEAD(&dev->adj_list.upper);
7641 INIT_LIST_HEAD(&dev->adj_list.lower);
7642 INIT_LIST_HEAD(&dev->all_adj_list.upper);
7643 INIT_LIST_HEAD(&dev->all_adj_list.lower);
7644 INIT_LIST_HEAD(&dev->ptype_all);
7645 INIT_LIST_HEAD(&dev->ptype_specific);
7646 #ifdef CONFIG_NET_SCHED
7647 hash_init(dev->qdisc_hash);
7649 dev->priv_flags = IFF_XMIT_DST_RELEASE | IFF_XMIT_DST_RELEASE_PERM;
7652 if (!dev->tx_queue_len) {
7653 dev->priv_flags |= IFF_NO_QUEUE;
7654 dev->tx_queue_len = 1;
7657 dev->num_tx_queues = txqs;
7658 dev->real_num_tx_queues = txqs;
7659 if (netif_alloc_netdev_queues(dev))
7663 dev->num_rx_queues = rxqs;
7664 dev->real_num_rx_queues = rxqs;
7665 if (netif_alloc_rx_queues(dev))
7669 strcpy(dev->name, name);
7670 dev->name_assign_type = name_assign_type;
7671 dev->group = INIT_NETDEV_GROUP;
7672 if (!dev->ethtool_ops)
7673 dev->ethtool_ops = &default_ethtool_ops;
7675 nf_hook_ingress_init(dev);
7684 free_percpu(dev->pcpu_refcnt);
7686 netdev_freemem(dev);
7689 EXPORT_SYMBOL(alloc_netdev_mqs);
7692 * free_netdev - free network device
7695 * This function does the last stage of destroying an allocated device
7696 * interface. The reference to the device object is released.
7697 * If this is the last reference then it will be freed.
7698 * Must be called in process context.
7700 void free_netdev(struct net_device *dev)
7702 struct napi_struct *p, *n;
7705 netif_free_tx_queues(dev);
7710 kfree(rcu_dereference_protected(dev->ingress_queue, 1));
7712 /* Flush device addresses */
7713 dev_addr_flush(dev);
7715 list_for_each_entry_safe(p, n, &dev->napi_list, dev_list)
7718 free_percpu(dev->pcpu_refcnt);
7719 dev->pcpu_refcnt = NULL;
7721 /* Compatibility with error handling in drivers */
7722 if (dev->reg_state == NETREG_UNINITIALIZED) {
7723 netdev_freemem(dev);
7727 BUG_ON(dev->reg_state != NETREG_UNREGISTERED);
7728 dev->reg_state = NETREG_RELEASED;
7730 /* will free via device release */
7731 put_device(&dev->dev);
7733 EXPORT_SYMBOL(free_netdev);
7736 * synchronize_net - Synchronize with packet receive processing
7738 * Wait for packets currently being received to be done.
7739 * Does not block later packets from starting.
7741 void synchronize_net(void)
7744 if (rtnl_is_locked())
7745 synchronize_rcu_expedited();
7749 EXPORT_SYMBOL(synchronize_net);
7752 * unregister_netdevice_queue - remove device from the kernel
7756 * This function shuts down a device interface and removes it
7757 * from the kernel tables.
7758 * If head not NULL, device is queued to be unregistered later.
7760 * Callers must hold the rtnl semaphore. You may want
7761 * unregister_netdev() instead of this.
7764 void unregister_netdevice_queue(struct net_device *dev, struct list_head *head)
7769 list_move_tail(&dev->unreg_list, head);
7771 rollback_registered(dev);
7772 /* Finish processing unregister after unlock */
7776 EXPORT_SYMBOL(unregister_netdevice_queue);
7779 * unregister_netdevice_many - unregister many devices
7780 * @head: list of devices
7782 * Note: As most callers use a stack allocated list_head,
7783 * we force a list_del() to make sure stack wont be corrupted later.
7785 void unregister_netdevice_many(struct list_head *head)
7787 struct net_device *dev;
7789 if (!list_empty(head)) {
7790 rollback_registered_many(head);
7791 list_for_each_entry(dev, head, unreg_list)
7796 EXPORT_SYMBOL(unregister_netdevice_many);
7799 * unregister_netdev - remove device from the kernel
7802 * This function shuts down a device interface and removes it
7803 * from the kernel tables.
7805 * This is just a wrapper for unregister_netdevice that takes
7806 * the rtnl semaphore. In general you want to use this and not
7807 * unregister_netdevice.
7809 void unregister_netdev(struct net_device *dev)
7812 unregister_netdevice(dev);
7815 EXPORT_SYMBOL(unregister_netdev);
7818 * dev_change_net_namespace - move device to different nethost namespace
7820 * @net: network namespace
7821 * @pat: If not NULL name pattern to try if the current device name
7822 * is already taken in the destination network namespace.
7824 * This function shuts down a device interface and moves it
7825 * to a new network namespace. On success 0 is returned, on
7826 * a failure a netagive errno code is returned.
7828 * Callers must hold the rtnl semaphore.
7831 int dev_change_net_namespace(struct net_device *dev, struct net *net, const char *pat)
7837 /* Don't allow namespace local devices to be moved. */
7839 if (dev->features & NETIF_F_NETNS_LOCAL)
7842 /* Ensure the device has been registrered */
7843 if (dev->reg_state != NETREG_REGISTERED)
7846 /* Get out if there is nothing todo */
7848 if (net_eq(dev_net(dev), net))
7851 /* Pick the destination device name, and ensure
7852 * we can use it in the destination network namespace.
7855 if (__dev_get_by_name(net, dev->name)) {
7856 /* We get here if we can't use the current device name */
7859 if (dev_get_valid_name(net, dev, pat) < 0)
7864 * And now a mini version of register_netdevice unregister_netdevice.
7867 /* If device is running close it first. */
7870 /* And unlink it from device chain */
7872 unlist_netdevice(dev);
7876 /* Shutdown queueing discipline. */
7879 /* Notify protocols, that we are about to destroy
7880 this device. They should clean all the things.
7882 Note that dev->reg_state stays at NETREG_REGISTERED.
7883 This is wanted because this way 8021q and macvlan know
7884 the device is just moving and can keep their slaves up.
7886 call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
7888 call_netdevice_notifiers(NETDEV_UNREGISTER_FINAL, dev);
7889 rtmsg_ifinfo(RTM_DELLINK, dev, ~0U, GFP_KERNEL);
7892 * Flush the unicast and multicast chains
7897 /* Send a netdev-removed uevent to the old namespace */
7898 kobject_uevent(&dev->dev.kobj, KOBJ_REMOVE);
7899 netdev_adjacent_del_links(dev);
7901 /* Actually switch the network namespace */
7902 dev_net_set(dev, net);
7904 /* If there is an ifindex conflict assign a new one */
7905 if (__dev_get_by_index(net, dev->ifindex))
7906 dev->ifindex = dev_new_index(net);
7908 /* Send a netdev-add uevent to the new namespace */
7909 kobject_uevent(&dev->dev.kobj, KOBJ_ADD);
7910 netdev_adjacent_add_links(dev);
7912 /* Fixup kobjects */
7913 err = device_rename(&dev->dev, dev->name);
7916 /* Add the device back in the hashes */
7917 list_netdevice(dev);
7919 /* Notify protocols, that a new device appeared. */
7920 call_netdevice_notifiers(NETDEV_REGISTER, dev);
7923 * Prevent userspace races by waiting until the network
7924 * device is fully setup before sending notifications.
7926 rtmsg_ifinfo(RTM_NEWLINK, dev, ~0U, GFP_KERNEL);
7933 EXPORT_SYMBOL_GPL(dev_change_net_namespace);
7935 static int dev_cpu_callback(struct notifier_block *nfb,
7936 unsigned long action,
7939 struct sk_buff **list_skb;
7940 struct sk_buff *skb;
7941 unsigned int cpu, oldcpu = (unsigned long)ocpu;
7942 struct softnet_data *sd, *oldsd;
7944 if (action != CPU_DEAD && action != CPU_DEAD_FROZEN)
7947 local_irq_disable();
7948 cpu = smp_processor_id();
7949 sd = &per_cpu(softnet_data, cpu);
7950 oldsd = &per_cpu(softnet_data, oldcpu);
7952 /* Find end of our completion_queue. */
7953 list_skb = &sd->completion_queue;
7955 list_skb = &(*list_skb)->next;
7956 /* Append completion queue from offline CPU. */
7957 *list_skb = oldsd->completion_queue;
7958 oldsd->completion_queue = NULL;
7960 /* Append output queue from offline CPU. */
7961 if (oldsd->output_queue) {
7962 *sd->output_queue_tailp = oldsd->output_queue;
7963 sd->output_queue_tailp = oldsd->output_queue_tailp;
7964 oldsd->output_queue = NULL;
7965 oldsd->output_queue_tailp = &oldsd->output_queue;
7967 /* Append NAPI poll list from offline CPU, with one exception :
7968 * process_backlog() must be called by cpu owning percpu backlog.
7969 * We properly handle process_queue & input_pkt_queue later.
7971 while (!list_empty(&oldsd->poll_list)) {
7972 struct napi_struct *napi = list_first_entry(&oldsd->poll_list,
7976 list_del_init(&napi->poll_list);
7977 if (napi->poll == process_backlog)
7980 ____napi_schedule(sd, napi);
7983 raise_softirq_irqoff(NET_TX_SOFTIRQ);
7986 /* Process offline CPU's input_pkt_queue */
7987 while ((skb = __skb_dequeue(&oldsd->process_queue))) {
7989 input_queue_head_incr(oldsd);
7991 while ((skb = skb_dequeue(&oldsd->input_pkt_queue))) {
7993 input_queue_head_incr(oldsd);
8001 * netdev_increment_features - increment feature set by one
8002 * @all: current feature set
8003 * @one: new feature set
8004 * @mask: mask feature set
8006 * Computes a new feature set after adding a device with feature set
8007 * @one to the master device with current feature set @all. Will not
8008 * enable anything that is off in @mask. Returns the new feature set.
8010 netdev_features_t netdev_increment_features(netdev_features_t all,
8011 netdev_features_t one, netdev_features_t mask)
8013 if (mask & NETIF_F_HW_CSUM)
8014 mask |= NETIF_F_CSUM_MASK;
8015 mask |= NETIF_F_VLAN_CHALLENGED;
8017 all |= one & (NETIF_F_ONE_FOR_ALL | NETIF_F_CSUM_MASK) & mask;
8018 all &= one | ~NETIF_F_ALL_FOR_ALL;
8020 /* If one device supports hw checksumming, set for all. */
8021 if (all & NETIF_F_HW_CSUM)
8022 all &= ~(NETIF_F_CSUM_MASK & ~NETIF_F_HW_CSUM);
8026 EXPORT_SYMBOL(netdev_increment_features);
8028 static struct hlist_head * __net_init netdev_create_hash(void)
8031 struct hlist_head *hash;
8033 hash = kmalloc(sizeof(*hash) * NETDEV_HASHENTRIES, GFP_KERNEL);
8035 for (i = 0; i < NETDEV_HASHENTRIES; i++)
8036 INIT_HLIST_HEAD(&hash[i]);
8041 /* Initialize per network namespace state */
8042 static int __net_init netdev_init(struct net *net)
8044 if (net != &init_net)
8045 INIT_LIST_HEAD(&net->dev_base_head);
8047 net->dev_name_head = netdev_create_hash();
8048 if (net->dev_name_head == NULL)
8051 net->dev_index_head = netdev_create_hash();
8052 if (net->dev_index_head == NULL)
8058 kfree(net->dev_name_head);
8064 * netdev_drivername - network driver for the device
8065 * @dev: network device
8067 * Determine network driver for device.
8069 const char *netdev_drivername(const struct net_device *dev)
8071 const struct device_driver *driver;
8072 const struct device *parent;
8073 const char *empty = "";
8075 parent = dev->dev.parent;
8079 driver = parent->driver;
8080 if (driver && driver->name)
8081 return driver->name;
8085 static void __netdev_printk(const char *level, const struct net_device *dev,
8086 struct va_format *vaf)
8088 if (dev && dev->dev.parent) {
8089 dev_printk_emit(level[1] - '0',
8092 dev_driver_string(dev->dev.parent),
8093 dev_name(dev->dev.parent),
8094 netdev_name(dev), netdev_reg_state(dev),
8097 printk("%s%s%s: %pV",
8098 level, netdev_name(dev), netdev_reg_state(dev), vaf);
8100 printk("%s(NULL net_device): %pV", level, vaf);
8104 void netdev_printk(const char *level, const struct net_device *dev,
8105 const char *format, ...)
8107 struct va_format vaf;
8110 va_start(args, format);
8115 __netdev_printk(level, dev, &vaf);
8119 EXPORT_SYMBOL(netdev_printk);
8121 #define define_netdev_printk_level(func, level) \
8122 void func(const struct net_device *dev, const char *fmt, ...) \
8124 struct va_format vaf; \
8127 va_start(args, fmt); \
8132 __netdev_printk(level, dev, &vaf); \
8136 EXPORT_SYMBOL(func);
8138 define_netdev_printk_level(netdev_emerg, KERN_EMERG);
8139 define_netdev_printk_level(netdev_alert, KERN_ALERT);
8140 define_netdev_printk_level(netdev_crit, KERN_CRIT);
8141 define_netdev_printk_level(netdev_err, KERN_ERR);
8142 define_netdev_printk_level(netdev_warn, KERN_WARNING);
8143 define_netdev_printk_level(netdev_notice, KERN_NOTICE);
8144 define_netdev_printk_level(netdev_info, KERN_INFO);
8146 static void __net_exit netdev_exit(struct net *net)
8148 kfree(net->dev_name_head);
8149 kfree(net->dev_index_head);
8152 static struct pernet_operations __net_initdata netdev_net_ops = {
8153 .init = netdev_init,
8154 .exit = netdev_exit,
8157 static void __net_exit default_device_exit(struct net *net)
8159 struct net_device *dev, *aux;
8161 * Push all migratable network devices back to the
8162 * initial network namespace
8165 for_each_netdev_safe(net, dev, aux) {
8167 char fb_name[IFNAMSIZ];
8169 /* Ignore unmoveable devices (i.e. loopback) */
8170 if (dev->features & NETIF_F_NETNS_LOCAL)
8173 /* Leave virtual devices for the generic cleanup */
8174 if (dev->rtnl_link_ops)
8177 /* Push remaining network devices to init_net */
8178 snprintf(fb_name, IFNAMSIZ, "dev%d", dev->ifindex);
8179 err = dev_change_net_namespace(dev, &init_net, fb_name);
8181 pr_emerg("%s: failed to move %s to init_net: %d\n",
8182 __func__, dev->name, err);
8189 static void __net_exit rtnl_lock_unregistering(struct list_head *net_list)
8191 /* Return with the rtnl_lock held when there are no network
8192 * devices unregistering in any network namespace in net_list.
8196 DEFINE_WAIT_FUNC(wait, woken_wake_function);
8198 add_wait_queue(&netdev_unregistering_wq, &wait);
8200 unregistering = false;
8202 list_for_each_entry(net, net_list, exit_list) {
8203 if (net->dev_unreg_count > 0) {
8204 unregistering = true;
8212 wait_woken(&wait, TASK_UNINTERRUPTIBLE, MAX_SCHEDULE_TIMEOUT);
8214 remove_wait_queue(&netdev_unregistering_wq, &wait);
8217 static void __net_exit default_device_exit_batch(struct list_head *net_list)
8219 /* At exit all network devices most be removed from a network
8220 * namespace. Do this in the reverse order of registration.
8221 * Do this across as many network namespaces as possible to
8222 * improve batching efficiency.
8224 struct net_device *dev;
8226 LIST_HEAD(dev_kill_list);
8228 /* To prevent network device cleanup code from dereferencing
8229 * loopback devices or network devices that have been freed
8230 * wait here for all pending unregistrations to complete,
8231 * before unregistring the loopback device and allowing the
8232 * network namespace be freed.
8234 * The netdev todo list containing all network devices
8235 * unregistrations that happen in default_device_exit_batch
8236 * will run in the rtnl_unlock() at the end of
8237 * default_device_exit_batch.
8239 rtnl_lock_unregistering(net_list);
8240 list_for_each_entry(net, net_list, exit_list) {
8241 for_each_netdev_reverse(net, dev) {
8242 if (dev->rtnl_link_ops && dev->rtnl_link_ops->dellink)
8243 dev->rtnl_link_ops->dellink(dev, &dev_kill_list);
8245 unregister_netdevice_queue(dev, &dev_kill_list);
8248 unregister_netdevice_many(&dev_kill_list);
8252 static struct pernet_operations __net_initdata default_device_ops = {
8253 .exit = default_device_exit,
8254 .exit_batch = default_device_exit_batch,
8258 * Initialize the DEV module. At boot time this walks the device list and
8259 * unhooks any devices that fail to initialise (normally hardware not
8260 * present) and leaves us with a valid list of present and active devices.
8265 * This is called single threaded during boot, so no need
8266 * to take the rtnl semaphore.
8268 static int __init net_dev_init(void)
8270 int i, rc = -ENOMEM;
8272 BUG_ON(!dev_boot_phase);
8274 if (dev_proc_init())
8277 if (netdev_kobject_init())
8280 INIT_LIST_HEAD(&ptype_all);
8281 for (i = 0; i < PTYPE_HASH_SIZE; i++)
8282 INIT_LIST_HEAD(&ptype_base[i]);
8284 INIT_LIST_HEAD(&offload_base);
8286 if (register_pernet_subsys(&netdev_net_ops))
8290 * Initialise the packet receive queues.
8293 for_each_possible_cpu(i) {
8294 struct softnet_data *sd = &per_cpu(softnet_data, i);
8296 skb_queue_head_init(&sd->input_pkt_queue);
8297 skb_queue_head_init(&sd->process_queue);
8298 INIT_LIST_HEAD(&sd->poll_list);
8299 sd->output_queue_tailp = &sd->output_queue;
8301 sd->csd.func = rps_trigger_softirq;
8306 sd->backlog.poll = process_backlog;
8307 sd->backlog.weight = weight_p;
8312 /* The loopback device is special if any other network devices
8313 * is present in a network namespace the loopback device must
8314 * be present. Since we now dynamically allocate and free the
8315 * loopback device ensure this invariant is maintained by
8316 * keeping the loopback device as the first device on the
8317 * list of network devices. Ensuring the loopback devices
8318 * is the first device that appears and the last network device
8321 if (register_pernet_device(&loopback_net_ops))
8324 if (register_pernet_device(&default_device_ops))
8327 open_softirq(NET_TX_SOFTIRQ, net_tx_action);
8328 open_softirq(NET_RX_SOFTIRQ, net_rx_action);
8330 hotcpu_notifier(dev_cpu_callback, 0);
8337 subsys_initcall(net_dev_init);